Added a test scene for scenes with children

Fixed an issue were rotations were being recorded as Euler and not as Quaternion
Fixed an issue were duplicate geometries were being recorded to the scene

Abstracted uuid creation logic from base classes
Improved the layout of controls in the export panel
Added option for indenting the JSON output (space saver)
Animation option is now an enum that requires a user to select between POSE and REST
Abstracted animation logic into a new module reducing the size of mesh.py
Improved indexing speeds for vertex colours and normal vectors
Node uuid is now based on name and will be persistent ver multiple exports
Empty arrays will no longer assign None to key values
Copying files will no longer remove the destination, additionally destinations are tested to see if the same as the source

Adjusted the precision widgets so they are laid out in a manner easier to read

Fixing a bad logic mistake where I the incorrect disk node type is queried against the wrong variable

Fixed menu label to read "Three.js".
Reimplemented the "Frame index as time" option.
Animation data is an array of all actions in the scene.
Reimplemented the latest skeletal animation logic that had previously been missed.
When copying textures destination files will be removed first.
Return values of several mush functions were not consistent and causing errors.

Moved exceptions and logger to the root of the package scope. This is to make these modules more accessible to the upcoming importer.
Added some error logging where exceptions are also raised.
Logger no longer assumes the file name. Sub-packages (exporter, importer) will define this name upon init.
Performed some code cleanup in exporter/geometry.py.

Fix Blender UV export for BufferGeometry

Added drawcalls example for buffergeometry

Update Creating-a-scene.html

Optimize TessellateModifier.js slightly

`.distanceTo()` -> `distanceToSquared()`

Various Math improvements from Clara.io

add docs per @WestLangley's request: https://github.com/mrdoob/three.js/pull/5788#issuecomment-67857995

remove Matrix4.makeShear per @WestLangley here: https://github.com/mrdoob/three.js/pull/5788#issuecomment-67852744

editor: add fullscreen mode