3D connexion support on Linux:

- Replace hidapi/linux/hid.c with the hidraw variant (link to udev)
- Add CMakeLists.txt for hidapi, refactor
- Add udev rules file (no installation so far)

src/slic3r/CMakeLists.txt

@@ -169,7 +169,7 @@ add_library(libslic3r_gui STATIC ${SLIC3R_GUI_SOURCES})
 
 encoding_check(libslic3r_gui)
 
-target_link_libraries(libslic3r_gui libslic3r avrdude cereal imgui ${GLEW_LIBRARIES} ${HIDAPI_LIBRARIES})
+target_link_libraries(libslic3r_gui libslic3r avrdude cereal imgui ${GLEW_LIBRARIES} hidapi)
 if (SLIC3R_PCH AND NOT SLIC3R_SYNTAXONLY)
     add_precompiled_header(libslic3r_gui pchheader.hpp FORCEINCLUDE)
 endif ()

src/slic3r/GUI/Mouse3DController.cpp

@@ -9,6 +9,8 @@
 
 #include <wx/glcanvas.h>
 
+// WARN: If updating these lists, please also update resources/udev/90-3dconnexion.rules
+
 static const std::vector<int> _3DCONNEXION_VENDORS =
 {
     0x046d,  // LOGITECH = 1133 // Logitech (3Dconnexion is made by Logitech)