WebGLRenderer: Remove gammaOutput, introduce outputEncoding.

Adding RoughnessMipmapper

Pass XRFrame reference to client render loop.

FullScreenQuad: Introduce dispose().

CSS3DRenderer: pointer-events should be with cameraElement

remove SSAOPass.quad.dispose, fixes #18148

CSS3Renderer: CSS pointer-events handling

BufferGeometry: use new .applyMatrix4() method

Remove unused xr.submitFrame()

DRACOLoader: Support repeated loading of same geometry

Material define types

GLTFLoader: Load materials and geometries in parallel

Examples: Improve performance of 'instancing / scatter' animation

BasisTextureLoader: Fix severe work distribution imbalance

Modularize: Remove WebVR.js

Instead of waiting for all materials of a mesh before fetching geometry
data, we now push all promises into one large array and wait on all of
this at once.

This means we can load .bin file in parallel with texture data when
texture assets are using separate files, and potentially start decoding
geometry earlier.