Examples: Clean up

Add parameter to Material to remove banding with dithering

ParametricGeometry: Optimize code

[glTF] Update BoomBox metal-rough demo.

Remove resetPose functionality.

Fix DragControls for containers not at (0,0)

Will be removed from spec going forward (handled at Platform level (or app)), better if just not present and relied upon.

See:
https://github.com/w3c/webvr/issues/189
https://bugs.chromium.org/p/chromium/issues/detail?id=706561

Add multiplication and equality methods to Matrix3

Modeled on same from Matrix4

This is due to the removal of the Matrix4 equivalent in d8f7ccf2

If the container (renderer.domElement) is not at the top-left corner of the browser,
the hit-test will always fail.
The `TransformControl` is using the correct way, so it doesn't have such issue.

Update DRACOLoader and DracoModule binary.

Adds isVersionSupported() method.

grammar/style copy-edit, a few minor clarifications

Added .jshintrc file to .gitignore

Docs: fixed links (Matrix4) and a few additions

Broken link to code style guide fixed

Geometries: Removed unused variables