[Bf-python] New method to import and export FBX files

[Art Golf]

Hi,

I have just found that I can import and export FBX files successfully, bone directions and animation channels are all fine.

1. Export an DAE file with Autodesk’s convert tool.

2. Edit the DAE file, delete the contents of these xml fields: <library_images>, <library_materials> and <library_effects>

3. Import the modified DAE file to Blender 2.76b, setup materials and textures, do whatever you want.

4. Export to FBX file.

Cheers!