[FIX] forums: Move the removal of wiki markup for outgoing mails so it works for replies made via the browser as well as incoming mail and check for feature_forum_parse pref

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/13.x@52986 b456876b-0849-0410-b77d-98878d47e9d5