GLTFLoader: Use extensionName for extensions[] access consistently

This is a minor cleanup - two of 5 extensions spelled out the extension
name twice, one as a case label and once as an array index.

Accept number in BufferAttribute definitions

Docs: Clarify Mesh.drawMode.

Fix some TypeScript definitions

Corrected typo in Spherical: axiz -> axis

Examples: Make domElement to a mandatory parameter for all controls.

ObjLoader2Parser materials are not applied in worker

#17615 Fix material assignment when Parser is run in worker. Additionally, allow material override from OBJLoader2.addMaterials to MaterialHandler.addMaterials

Fix for TypeScript - optional parameter in WebVR.d.ts

Docs: Fix gamedev.net link in Matrix4 page.

Editor: Commented out sheen code.

Examples: Remove revision log from all renderers.

Docs: Remove usage of Geometry in DrawModes.

Update DrawModes.html

There was a typo in the vertex list for THREE.TrianglesDrawMode.

P.S.: Options are only relevant for a BufferGeometry, but the example uses a Geometry...

SpriteMaterial: add alphaMap support

WebGLShadowMap: Fixed InstancedMesh support.

Upgrade dev dependencies.

WebXR API: Replace supportsSession with isSessionSupported