Add normal Cura profile reader

This re-introduces the old functionality where you can import .curaprofile files. It's just now in the plug-in format.

Contributes to issue CURA-34.

plugins/CuraProfileReader/CuraProfileReader.py

@@ -0,0 +1,39 @@
+# Copyright (c) 2015 Ultimaker B.V.
+# Cura is released under the terms of the AGPLv3 or higher.
+
+from UM.Application import Application #To get the machine manager to create the new profile in.
+from UM.Settings.Profile import Profile
+from UM.Settings.ProfileReader import ProfileReader
+
+##  A plugin that reads profile data from Cura profile files.
+#
+#   It reads a profile from a .curaprofile file, and returns it as a profile
+#   instance.
+class CuraProfileReader(ProfileReader):
+    ##  Initialises the cura profile reader.
+    #
+    #   This does nothing since the only other function is basically stateless.
+    def __init__(self):
+        super().__init__()
+
+    ##  Reads a cura profile from a file and returns it.
+    #
+    #   \param file_name The file to read the cura profile from.
+    #   \return The cura profile that was in the file, if any. If the file could
+    #   not be read or didn't contain a valid profile, \code None \endcode is
+    #   returned.
+    def read(self, file_name):
+        profile = Profile(machine_manager = Application.getInstance().getMachineManager(), read_only = False) #Create an empty profile.
+        serialised = ""
+        try:
+            with open(file_name) as f: #Open file for reading.
+                serialised = f.read()
+        except IOError as e:
+            Logger.log("e", "Unable to open file %s for reading: %s", file_name, str(e))
+            return None
+        
+        try:
+            profile.unserialise(serialised)
+        except Exception as e: #Parsing error. This is not a (valid) Cura profile then.
+            return None
+        return profile