AntagHUD restrictions, disallow players becoming mice.

If antagHUD respawn restrictions are enabled, players will no longer be able
to use the "become mouse" verb if they have enabled their antagHUD's.

Observers were able to use antagHUD then become mice and die resetting their "has_used_antagHUD" variable allowing them to respawn bypassing the restrictions by becoming a mouse as well as respawning later.
Fixed Xeno-Arch Chem-Dispenser

Admin request as well as overwhelming support on a thread.
http://baystation12.net/forums/viewtopic.php?f=5&t=9306

I've seen Admins fix this everytime someone asks so going to just save them the trouble.
Merge pull request #4302 from Ccomp5950/mouse_antagHUD

AntagHUD restrictions, disallow players becoming mice.
Merge pull request #4281 from Ccomp5950/chem_fix

Fixed Xeno-Arch Chem-Dispenser
Removed book that causes braindeadness

Choosing a certain religion name and/or deity causes player to start out with 100 brain loss.  Removed that.
Merge pull request #4307 from Kani0824/patch-2

Removed book that causes braindeadness
Fixed rad collector toxin drain bug

Removed bad code modifying variables directly and replaced it with a proc that correctly modifies the gas volume.
Merge pull request #4320 from Loganbacca/bayfix-4315

Rad collector fix
Admin requested addition of a global dsay toggle.
fix for muting deadme as well.
Merge pull request #4323 from DJSnapshot/hotfix

Admin requested addition of a global dsay toggle
Fixes an error with the explosions-deleting-zone-air detection.
Merge pull request #4330 from SkyMarshal/patch-6

Fixes an error with the explosions-deleting-zone-air detection.