Traitor Panel Improvements

-Added logging for admins editing objectives
-Added logging for admins adding new antagonists
-Changed the antag role assignment buttons to something more appropriate for the game modes. Will now tell you if someone is loyal (implanted).
-Added a isloyal() proc to check if a mob is loyalty implanted.
-Made the headrev message more noticeable
Merge pull request #804 from Ikarrus/tplog

Traitor Panel Improvements