This reverts commit 0359d571.

- three.js issue 13197:
  - Added forceWorkerDataCopy to THREE.LoaderSupport.WorkerSupport and THREE.LoaderSupport.WorkerDirector
  - THREE.OBJLoader2 handles cached resources properly. This increases overall performance as no unnecessary reloads are requested.
- THREE.OBJLoader2: Reduced Parser complexity:
  - Simplified slash counting used for face type detection
  - One buildFace fucntion is used for all four face types, lines and points including indices (=vertex reduction) creation if wanted.
  - String processing (o, g, mtllib and usemtl) just concatenates chars
  - Overall speed improvements due simpler code paths
- Removed THREE.LoaderSupport.ConsoleLogger: Added setLogging function as replacement where. Console logging is behind boolean flags.
- Removed THREE.LoaderSupport.LoaderBase: Many functions are coupled with OBJLoader2. It was simply not generic enough and added unneeded complexity.
- Reduced THREE.LoaderSupport.PrepData to minimum set of generic functions. Simple properties are added by demand and are no longer enforced.
- Renamed THREE.LoaderSupport.Builder to THREE.LoaderSupport.MeshBuilder
- Updated documentation