Loader: Remove Handlers.

Examples: Remove usage of BufferAttribute.setArray().

Cleanup Geometry and DirectGeometry TS

JSM: Update modules.

DracoLoader: Clean up.

GLTFExporter: Fixed alphaMode handling

Update Loading-3D-models.html

To add another troubleshooting step that could be useful. The problem I had in order to make the model visible was that it was hidden in the dark. Once I added and positioned a light source, the model appeared. Maybe someone else could have the same problem and could solve it more quickly than me.

WebXR: request common reference spaces as features

WebXR's requestReferenceSpace only works if the corresponding feature
was requested at session creation time. For simplicity, just ask for
the interesting ones as optional features, but be aware that the
requestReferenceSpace call will fail if it turns out to be unavailable.
('local' is always available for immersive sessions and doesn't need to
be requested separately.)

Take receiveShadow flag into account for shadowMask

Docs: Fix a spelling error

Update OBJLoader2.html

This fixes objects with MeshLambertMaterial that used to erroneously receive shadows.

In the code in the documentation  is "event.detail.loaderRootNode", but it returns a object3d as in the live example.

WebGLTextures: Ensure OffscreenCanvas provides drawing context.

DragControls: Remove deprecated API and checks.

Fix toggling receiveShadow without changing material