Ghost buffed with AntagHUD

Created a feature where ghosts can now see who the antaonists are in a round.

Created a configuration option for if antagHUD is allowed at all that can be toggled by admins as well as set in config.txt)

Created a configuration option for if antagHUD users would be restricted from joining the game can be toggled by admins for all users (adminverb in server tab:  Toggle AntagHUD restrictions) or can allow individual users to respawn (adminverb in Special Verbs tab:  "allow character respawn")

An admin toggling either of those options (Disabling it all together or turning on restrictions) will disabled AntagHUD for the users currently using it.

Added the ability to "Job Ban" specific users from using the AntagHUD feature, it's listed under "non-human" by the AI, robot, and PAI listing.  However jobbanning "All Non-Human" will not job ban AntagHUD users as well.  It's simply there because I had no idea where else to put it.

Updated the HUD icons(Hud.dmi) to use the same HUD icons the antagonists see when using them(Mob.dmi), the items in Hud.dmi were a bit outdated.