ObjectLoader: Clean up.

Fix typo.

Remove reference to converters.

Docs: updated korean api/ko/animation/tracks, api/ko/audio

Remove converter scripts.

src: ES6 default value.

Simple collision example

Docs: Clarify Raycaster.set().

Docs: updated korean reference/animation(rebased)

Fix type declaration of Vector4

Docs: Clean up.

Docs: list.json curly braces symmetry.

More detailed error messages when using invalid object types.

EdgeSplitModifier - Keep normals

EdgeSplitModifier - Support other attributes