css.lang, less.lang, scss.lang: Minor updates
These are some minor updates I've accumulated; some are feature updates (comments in vendor-specific rules, @charset handling), others are behind-the-scenes housekeeping (character escapes, regex ids).
These are some minor updates I've accumulated; some are feature updates (comments in vendor-specific rules, @charset handling), others are behind-the-scenes housekeeping (character escapes, regex ids).