Updated HUD Icons

Was using some rather outdated icons.  Copied the icons from mob.dmi and
named them appropriately.
The Ghost AntagHUD Feature.

Created configurations for Server Admins to be able to toggle it within default config.

Modified my previous AdminVerb that allows respawns to bypass the limitations of the restrictions while also letting the admins know if the ghost has used AntagHUD

Created restriction checks for various forms of joining the round and if administrators/hosts have restricted AntagHUD users from joining the round they will not be able to.

To Do:
Create Adminverb for toggling restrictions to also be able to toggle everyones ability to use antagHUD for a round.
Create a method for "Job Banning" users from using antagHUD.
Added Adminverbs for turning off and on the various items needed.

Also added the proc get_ghosts() with 2 versions of output, it defaults to returning a mob list but can be set to return a list for use with an input window.
Included JobBan menu and systems for AntagHUD
String fix on adminverb

Added holder checks so admins can use antagHUD regardless of restrictions.
Cleanup:  Removed unneeded variables and a debug variable.
Merge pull request #3933 from Ccomp5950/ghost_buff

Ghost buffed with AntagHUD