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
 * Makes the "point to" verb garbage collect the pointers instead of deleting them.
 * Fixed a typo causing double agents to late join with no objectives.
Merge pull request #818 from Giacomand/db_Fix

* Fixed a typo causing double agents to late join with no objectives.
Merge pull request #816 from Giacomand/point_to

 * Makes the "point to" verb garbage collect the pointers instead of del...
Merge pull request #804 from Ikarrus/tplog

Traitor Panel Improvements
Merge branch 'master' of https://github.com/Giacomand/-tg-station into tator_typos

Conflicts:
	code/modules/admin/topic.dm