*some* gltf hierarchy still doesn't load as expected

[Ybalrid]

AlphaBlendTest and Orientation test specifically don't load correctly.

Now that rendering has been fixed for most files (#11) it seems that there are still some issues.

• maya exported iclone model doesn't have proper transform on teeth
• AlphaBlendTest and OrientationTest are totally mangled.
• CesiumMan's skeleton play animation fine, but skeleton and geometry are at 90° from each other.

These issues point out to an error in the way rotations are handled. At first glance, everything looks normal, especially local coordinates loading.

This need careful inspection of the mathematical result from re-composition of TRS matrices and all quaternion manipulations.