v1.22.0

Remove

• Remove 2 options: icons and iconsColor (df1deb3)
  Instead, replace src/assets/*.svg then rebuild player to customize icons, and use CSS to control icons color

Rename

• Rename danmaku.margin to danmaku.bottom, values like: '10px' '10%' (a16c948)

Improvements

• Use svg-inline-loader to separation svg (df1deb3)
• Use art-template to separation HTML (a16c948)