Blender Git Loki

Fix [#21084] Collada messing up geometry on import and renaming uvlayers
Reported by Michael Williamson

Add support to write the uvlayer name as found in <bind_vertex_input> semantic attribute (Blender
exports in this one too, so reimport goes ok now).

I have created a patch for OpenCOLLADA to be applied against r769, which is needed
for this fix to work: http://code.google.com/p/opencollada/issues/detail?id=117

The Windows OpenCOLLADA updated builds (r769+patches) will be committed after this.

Note: This means that linux and osx users will have to patch OpenCOLLADA themselves, until
it's committed (or in case of OSX the libs updated in lib/darwinXXX).