Scene Background: support WebGLRenderTargetCube

OBJLoader2_V250 documentation update

[Documentation] Property type correction

Cube and Equirect shaders: improve nomenclature

Fixed property types of  `isInterleavedBuffer` and `needsUpdate`

Remove Material.overdraw property

[Examples] added scene comparison example

Add eslint-plugin-html

Remove CanvasRenderer

BoxHelper: added copy and clone methods

Line: fix copy and clone methods

Rollup: Added plugin for converting gl constants to their values.

OBJLoader2 V2.5.0

- Original Repo Issue 47: Fixed incorrect vertex color pointerC initialization (omitting first set of values)
- Original Repo Pull Request 46: It is now possible to run `THREE.OBJLoader2` in nodejs 10.5.0+. Thanks to @Cobertos
- Replaced Singletons with pure function/prototype definitions (backport from dev (V3.0.0)). Reason: Counter issues with worker code Blob generation from minified code base (e.g when using webpack)
- #12942: Align `setPath` and `setResourcePath` meaning and handling

ArrowHelper: support cloning

Fix linter errors in WebGL examples

RGBELoader: support FloatType output

EquirectangularToCubeGenerator: support alternate encodings

Docs: Added manual page about WebGL 2

Docs: Added DataTexture3D page

Docs: Clean up

Translation zh