userHighlight firstCommenter does not not highlight OP if highlightOP is enabled
quick refactor
userHighlight.coloredUsernames "done this user already" guard fixed
userHighlight OP/admin/mod/friend highlighting slightly higher specificity
to override firstCommenter
revert 295c5ae because 95b01c9 accomplishes the same
Merge pull request #621 from andytuba/issue_621

"highlight first commenter" overrides "submitter" background from userHighlighter