TS: add alphaMap to MeshDistanceMaterial

Specified datatype of root object in AnimationMixer.d.ts

Added missing constructor in AnimationAction.d.ts

EXRLoader: Clean up

Examples: Avoid delayed updating of cube cameras in webgl_materials_cubemap_dynamic.

Docs: Clarify Object3D.getObjectBy*() methods.

This support for alpha maps is consistent with the implementation of the other built-in materials.

When i use the three 0.109.0 version and try https://threejs.org/examples/#webgl_shadowmap_pointlight this demo, it crashed.
add alphaMap support can fixed this bug.

3MFLoader: Fix typo.

- we can update the unattached cube camera just before attaching it to avoid the unnessary delay
- we don't need to hide the sphere temporarily as we're using single sided materials

3MFLoader: Better handle face colors.

3MFLoader: Add support for metallic display properties.

Examples: Clean up.

WebXR: Update origin trials token.

Examples: WebKit prevent <video> auto fullscreen iPhone.

3MFLoader: Added missing flatShading.

Examples: Clean up.

3MFLoader: Add support for vertex colors.

rename export const from `VolumeShader` to `VolumeRenderShader1`

CSS2DRenderer: Ensure child DOM elements are correctly removed.

Examples: Clean up.