WorkerExecutionSupport: buildWorker uses CodeBuilderInstructions to decide how to internally build the worker (standard or jsm based)

WorkerExecutionSupport allows to run runtime code or pre-defined modules (if browser support is available) in a web worker.

Deleted non jsm code and removed obj2 examples currently not working.

Object3D: Dispatch event in .add()/.remove() when operation is done.

Editor: Resolve more 404 errors.

Editor: Add missing lib.

Tests: Clean up

Fix typescript definition.

JSM: Update name of external libs.

add more unit tests

Material: Clean up serialization/deserialization.

Fix travis build

Examples: Rename DracoExporter to DRACOExporter.

Docs: Explain the 2D contour

WebVR: Use XR NOT FOUND string with WebXR API

Expose CubeCamera.clear() to TS

"according to the definition of this method."

WebVR: Catch xr.supportsSession() rejection

add quaternion tests

add Plane unittests

NodeMaterial revision

refined large screen layout & type scale