[Bf-python] FBX/XNA Exporter

[Campbell Barton]

Hi John,

Recently I've been working on fixing FBX bugs as well as making some
API updates, and unless I someone syncs these updates with XNA export,
this script may become unsupported, or at least remain with known
bugs.

Some months back I used the XNA export as a reference for making the
FBX exporter compatible with UDK.
- Don't export dummy root object anymore.
- Use modified order of connection exporting similar to XNA export.
- Modified bone connections (cant recall exactly what changed - will
be in svn log, but the way bones and the mesh bind was modified for
XNA which was needed for UDK also).

Would you be able to test if a recent FBX exporter (not XNA) from
graphicall exports FBX's compatible with XNA?

Thanks

CC-ing bf-python in case others are able to test with XNA or give extra info.

-- 
- Campbell