FBXLoader: Filter object names with PropertyBinding.sanitizeNodeName().

Fixes #12295.

FBXLoader: Added bumpScale support

Added refractor example

FBXLoader: fixed undefined variable and minor code style updates

Support transformed pivots in FBXLoader

Outline line sprite

Fix a couple references to background in WebGLRenderer after context loss/restored

Converted 'View Source' button to an anchor element in Examples section

when setting a texture, or a black color as scene.background, outline was weird, or invisible.

Tests: Added remaining unit tests for src/math/*.js

GLTFLoader: Explicitly clone ShaderMaterial properties.

loading of multiple uv coordinates

Fix various es-lint errors

FBXLoader: Added check for presence of GlobalSettings to ambient light

Audio: Fix start time and offset