WebGLRenderer: Ignore map alpha in opaque materials

Fix glTF mask

KeyframeTrack: Clarify if-clause in .trim().

Examples: Add CSM implementation

Vector2.angle() performance

ObjectLoader: Remove usage of LegacyJSONLoader.

Editor: Add support for vertexTangents.

WebGLRenderLists: Avoid possible memory leak when managing render items.

Clean up tests on BufferGeometryUtils and GLTFExporter.

Material: Move vertexTangents to MeshStandardMaterial.

BokehShader: Fix wrong format of render target.

Examples: Clean up.

WebXRManager: Added framebuffer scaling back in

Remove old references from currentRenderList to make sure no memory is leaked when the object count is reduced.

SceneUtils: Introduce createMeshesFromInstancedMesh().

Examples: Clean up.

GLTFLoader: Update typings.

GLTFLoader: Return Group, not Scene.

Docs: Clean up page of ShadowMaterial and LightShadow classes.