Add support for loading SkinnedMeshes from SceneLoader + bug fix.

Multitouch fix for TrackballControls

Renaming of commands (aesthetics)

Added "var " before function expressions

Fix for #7185. After using two fingers, the camera would rapidly rotate if both fingers were not removed simultaneously. Adding in some state checks in `touchmove` and `touchend` prevents the jump from the null `_movePrev`, allowing users to quickly go from zooming and panning to rotating.

adjustments to the documentation according to naming convention. Old: "Cmd[..].js" new: "[..]Command.js"

Implementation of Undo/Redo functionality for threejs-editor

Basic and Lambert variations examples

TODO: Reimplement 5a06da2a and 45908e74

simple material variations for phong and physical.