Background Shader: Support decoding, tone mapping, and output encoding

do gpu picking with 1x1 pixel render target

Background Shader: Simplify vertex shader

BufferGeometry docs: clarification

Docs: Clean up

translate math part

SMAAPass: Texture marked for update but image is incomplete

GLTFLoader + DRACOLoader: Fix bugs in glTF+Draco decompression.

[EXAMPLES] Added BufferGeometry morph example

Background shader: support texture offset/repeat

ObjectLoader: Fix loading multiple materials with the same uuid

Editor: i18n

Prefetch DRACO decoder on DRACO endcoded glTF load

Docs: Zh translation for texture folder,some new pages and list.js,and corrections for some wrong characters.

merge the commit from upstream