Working on FBX uploads (i.e., without FST).
More work on setting model properties before upload.
More work on avatar customization.
Forgot to remove debugging code.
Need to open the temporary file in order to get the path.
Allow users to clear the head URL and have no separate head model.
Need to initialize this to an invalid URL, too.
Recode textures on upload if they're uncompressed or bigger than our maximum
size.
Temporary hack for models from Mixamo Fuse until I can figure out the exact
problem.
Merge branch 'master' of https://github.com/highfidelity/hifi

Conflicts:
	interface/src/avatar/MyAvatar.h
Merge pull request #2767 from ey6es/master

Allow uploading FBXs without FSTs; a dialog pops up on upload to allow customizing the various properties, with presets for Mixamo/Autodesk avatar generators.  Also enforces texture limits and adds joint indices.