Update CSS3 color names

The CSS3 spec *includes* the more esoteric colour names ("papayawhip"
etc.), contrary to what the incorrect W3Schools article that was
previously referenced in SCSS.tmLanguage had said. Now these keywords
will not be marked as deprecated, preventing the alert highlighting
present on almost all colour schemes.

This commit is taken from https://github.com/MattDMo/sublime-packages/commit/5f38f50d05e8b63488bfab25d3f6b00099934a99