Interim update (editor crash, rotations)

Interim update, some partial fixes:

Better gltf error recovery, instead of crashing the editor, note in the dev console the issue of loading files and throw an alert. To correct this, change the filename back to 'path', reload the project, and use a different file next time.

Somewhat better rotation when rotating a model with skinned and non-skinned nodes. For a single axis of rotation, they will both rotate in the same way.

However, still, an error when rotating skinned and non-skinned nodes with more than two axes of rotation, they do not rotation in the same direction for all axes of changed rotation.