1.2.0: Added a number of new tools

• Added a script that retargets Mixamo animations to custom skeleton.
• Added a fbxaxisconvert command to convert between coordinate systems.
• Added bounding box calculation to fbxinspect and usdinspect.
• Added fbxscale tool for scaling FBX models that may not have the correct unit set.
• Added fbxunit script.
• Added fbxinspect script that does the corresponding FBX inspection as usdinspect does for USD files.
• Added append-fbx-skeletal-animation script for adding animation takes from an FBX file to another FBX file.
• Added skeleton hierarchy section to usdinspect.

1.1.0: Eliminated parent file. Added option directory structure.

• Change _materials suffix to -Materials
• Eliminate the need for the parent file by putting the animation library in the main file.
• Add the option to create a directory structure when exporting.