FBX file version check

[mgsx-dev]

recent FBX file version (7500) fails silently and output empty G3D file.

surprizingly, FBX SDK importer doesn't raise any error, so i added a check. I didn't found a better way to check this in FBX SDK documentation :

• with a supported file (7400), GetFileVersion reports 7.4.0 and mFileVersion is 7400
• with an unsupported file (7500), GetFileVersion reports 7.5.0 but mFileVersion is 0

So i made an assumption on mFileVersion value and only output an error log.

notes:

• latest blender FBX exporter output supported FBX files (7400)
• supported versions are listed in FBX SDK sources : fileio/fbx/fbxio.h
• i included an unsupported FBX file (7500) for testing purpose.

Dirt_Cube__texture.zip