OBJLoader2 V2.1.0: New Builder and WorkerSupport features

DeviceOrientationControls mods

WWParallels demo use the same logger everywhere now.
Updated documentation.

Examples: Improve basic geometry demos

Examples: Added WebAudio timing example

lengthManhattan() -> manhattanLength()

Add missing words for Geometry docs

Docs/Tests: Clean up references to RectAreaLightShadow

Examples: Clean up webgl_geometries2.html

- Builder enhancements:
 - Materials can be added to it as regular objects, as jsonified objects (e.g. from worker) and as clone instruction (map of property and value)
 - Separated mesh processing from material processing
 - Builder no longer defines default materials. This is no the responsibility of the user (loader)
- WorkerSupport is now able to load arbitrary js files into Blob used to create the Worker (as exemplary shown and used in MeshSpray)
- Updated documentation

FBXLoader: support different framerates

distanceToManhattan() -> manhattanDistanceTo()

remove inline fn in Box3.expandByObject to reduce GC

GLTFLoader: Fix typo in skin/joint traversal.

ObjectLoader lacking support for some geometries, Docs update

GLTFLoader: Reuse file loader

FBXLoader: switched default material type to Phong

GLTFLoader: Clean up node pre-processing.