WIP: Moved sources int src/, separated most of the source code from Perl.

The XS was left only for the unit / integration tests, and it links
libslic3r only. No wxWidgets are allowed to be used from Perl starting
from now.

src/glew/LICENSE.txt

@@ -0,0 +1,73 @@
+The OpenGL Extension Wrangler Library
+Copyright (C) 2002-2007, Milan Ikits <milan ikits[]ieee org>
+Copyright (C) 2002-2007, Marcelo E. Magallon <mmagallo[]debian org>
+Copyright (C) 2002, Lev Povalahev
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without 
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, 
+  this list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright notice, 
+  this list of conditions and the following disclaimer in the documentation 
+  and/or other materials provided with the distribution.
+* The name of the author may be used to endorse or promote products 
+  derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+THE POSSIBILITY OF SUCH DAMAGE.
+
+
+Mesa 3-D graphics library
+Version:  7.0
+
+Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+Copyright (c) 2007 The Khronos Group Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and/or associated documentation files (the
+"Materials"), to deal in the Materials without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Materials, and to
+permit persons to whom the Materials are furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Materials.
+
+THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.

src/glew/README.md

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+THIS IS NOT THE COMPLETE GLEW DISTRIBUTION. ONLY FILES NEEDED FOR COMPILING GLEW INTO SLIC3R WERE PUT INTO THE SLIC3R SOURCE DISTRIBUTION.
+
+# GLEW - The OpenGL Extension Wrangler Library
+
+![](http://glew.sourceforge.net/glew.png)
+
+http://glew.sourceforge.net/
+
+https://github.com/nigels-com/glew
+
+[![Build Status](https://travis-ci.org/nigels-com/glew.svg?branch=master)](https://travis-ci.org/nigels-com/glew)
+[![Gitter](https://badges.gitter.im/nigels-com/glew.svg)](https://gitter.im/nigels-com/glew?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
+[![Download](https://img.shields.io/sourceforge/dm/glew.svg)](https://sourceforge.net/projects/glew/files/latest/download)
+
+## Downloads
+
+Current release is [2.0.0](https://sourceforge.net/projects/glew/files/glew/2.0.0/).
+[(Change Log)](http://glew.sourceforge.net/log.html)
+
+Sources available as 
+[ZIP](https://sourceforge.net/projects/glew/files/glew/2.0.0/glew-2.0.0.zip/download) or
+[TGZ](https://sourceforge.net/projects/glew/files/glew/2.0.0/glew-2.0.0.tgz/download).
+
+Windows binaries for [32-bit and 64-bit](https://sourceforge.net/projects/glew/files/glew/2.0.0/glew-2.0.0-win32.zip/download).
+
+### Recent snapshots
+
+Snapshots may contain new features, bug-fixes or new OpenGL extensions ahead of tested, official releases.
+
+[glew-20160708.tgz](http://sourceforge.net/projects/glew/files/glew/snapshots/glew-20160708.tgz/download)
+*GLEW 2.0.0 RC: Core context, EGL support, no MX*
+
+[glew-20160402.tgz](http://sourceforge.net/projects/glew/files/glew/snapshots/glew-20160402.tgz/download)
+*GLEW 2.0.0 RC: Core context, EGL support, no MX*
+
+## Build
+
+From a downloaded tarball or zip archive:
+
+### Linux and Mac
+
+#### Using GNU Make
+
+##### Install build tools
+
+Debian/Ubuntu/Mint:    `$ sudo apt-get install build-essential libxmu-dev libxi-dev libgl-dev libosmesa-dev git`
+
+RedHat/CentOS/Fedora:  `$ sudo yum install libXmu-devel libXi-devel libGL-devel git`
+
+##### Build
+
+	$ make
+	$ sudo make install
+	$ make clean
+
+Targets:    `all, glew.lib, glew.bin, clean, install, uninstall`
+
+Variables:  `SYSTEM=linux-clang, GLEW_DEST=/usr/local, STRIP=`
+
+#### Using cmake
+
+*CMake 2.8.12 or higher is required.*
+
+##### Install build tools
+
+Debian/Ubuntu/Mint:   `$ sudo apt-get install build-essential libXmu-dev libXi-dev libgl-dev git cmake`
+
+RedHat/CentOS/Fedora: `$ sudo yum install libXmu-devel libXi-devel libGL-devel git cmake`
+
+##### Build
+
+	$ cd build
+	$ cmake ./cmake 
+	$ make -j4
+
+| Target     | Description |
+| ---------- | ----------- |
+| glew       | Build the glew shared library. |
+| glew_s     | Build the glew static library. |
+| glewinfo   | Build the `glewinfo` executable (requires `BUILD_UTILS` to be `ON`). |
+| visualinfo | Build the `visualinfo` executable (requires `BUILD_UTILS` to be `ON`). |
+| install    | Install all enabled targets into `CMAKE_INSTALL_PREFIX`. |
+| clean      | Clean up build artifacts. |
+| all        | Build all enabled targets (default target). |
+
+| Variables       | Description |
+| --------------- | ----------- |
+| BUILD_UTILS     | Build the `glewinfo` and `visualinfo` executables. |
+| GLEW_REGAL      | Build in Regal mode. |
+| GLEW_OSMESA     | Build in off-screen Mesa mode. |
+| BUILD_FRAMEWORK | Build as MacOSX Framework.  Setting `CMAKE_INSTALL_PREFIX` to `/Library/Frameworks` is recommended. |
+
+### Windows
+
+#### Visual Studio
+
+Use the provided Visual Studio project file in build/vc12/
+
+Projects for vc6 and vc10 are also provided
+
+#### MSYS/Mingw
+
+Available from [Mingw](http://www.mingw.org/)
+
+Requirements: bash, make, gcc
+
+	$ mingw32-make
+	$ mingw32-make install
+	$ mingw32-make install.all
+
+Alternative toolchain:  `SYSTEM=mingw-win32`
+
+#### MSYS2/Mingw-w64
+
+Available from [Msys2](http://msys2.github.io/) and/or [Mingw-w64](http://mingw-w64.org/)
+
+Requirements: bash, make, gcc
+
+	$ pacman -S gcc make  mingw-w64-i686-gcc mingw-w64-x86_64-gcc 
+	$ make
+	$ make install
+	$ make install.all
+
+Alternative toolchain:  `SYSTEM=msys, SYSTEM=msys-win32, SYSTEM=msys-win64`
+
+## glewinfo
+
+`glewinfo` is a command-line tool useful for inspecting the capabilities of an
+OpenGL implementation and GLEW support for that.  Please include the output of
+`glewinfo` with bug reports, as appropriate.	
+
+	---------------------------
+	    GLEW Extension Info
+	---------------------------
+
+	GLEW version 2.0.0
+	Reporting capabilities of pixelformat 3
+	Running on a Intel(R) HD Graphics 3000 from Intel
+	OpenGL version 3.1.0 - Build 9.17.10.4229 is supported
+
+	GL_VERSION_1_1:                                                OK
+	---------------
+
+	GL_VERSION_1_2:                                                OK
+	---------------
+	  glCopyTexSubImage3D:                                         OK
+	  glDrawRangeElements:                                         OK
+	  glTexImage3D:                                                OK
+	  glTexSubImage3D:                                             OK
+	
+	...
+
+## Code Generation
+
+A Unix or Mac environment is neded for building GLEW from scratch to
+include new extensions, or customize the code generation. The extension
+data is regenerated from the top level source directory with:
+
+	make extensions
+
+An alternative to generating the GLEW sources from scratch is to
+download a pre-generated (unsupported) snapshot:
+
+https://sourceforge.net/projects/glew/files/glew/snapshots/
+
+Travis-built snapshots are also available:
+
+https://glew.s3.amazonaws.com/index.html
+
+## Authors
+
+GLEW is currently maintained by [Nigel Stewart](https://github.com/nigels-com)
+with bug fixes, new OpenGL extension support and new releases.
+
+GLEW was developed by [Milan Ikits](http://www.cs.utah.edu/~ikits/)
+and [Marcelo Magallon](http://wwwvis.informatik.uni-stuttgart.de/~magallon/).
+Aaron Lefohn, Joe Kniss, and Chris Wyman were the first users and also
+assisted with the design and debugging process.  
+
+The acronym GLEW originates from Aaron Lefohn.
+Pasi Kärkkäinen identified and fixed several problems with
+GLX and SDL.  Nate Robins created the `wglinfo` utility, to
+which modifications were made by Michael Wimmer.  
+
+## Copyright and Licensing
+
+GLEW is originally derived from the EXTGL project by Lev Povalahev.
+The source code is licensed under the 
+[Modified BSD License](http://glew.sourceforge.net/glew.txt), the 
+[Mesa 3-D License](http://glew.sourceforge.net/mesa.txt) (MIT) and the
+[Khronos License](http://glew.sourceforge.net/khronos.txt) (MIT).
+
+The automatic code generation scripts are released under the 
+[GNU GPL](http://glew.sourceforge.net/gpl.txt).