Added a "Deadman's switch" (Not really) to the signaler, shooting while standing off makes the other guy shoot, balanced stunning, added a time limit to switching hostage modes.

Signalers: Right click verb makes you ready to signal it, being shot with it in your active hand has a 80% chance to trigger it, dropping it has a 5% chance.
Stunning always stuns you SOME, but armor can now lessen it (It used to be possible to not get stunned at all by being shot normally)
Shooting during a mexican standoff now makes the other guy shoot you too.
Added a time to how quickly you can adjust hostage things.  1.5 seconds per thing.

code/modules/projectiles/gun.dm

@@ -181,6 +181,7 @@
 	proc/TargetActed()
 		var/mob/M = loc
 		if(target == M) return
+		usr.last_move_intent = world.time
 		Fire(target,usr)
 		var/dir_to_fire = sd_get_approx_dir(M,target)
 		if(dir_to_fire != M.dir)

code/modules/projectiles/guns/projectile/revolver.dm

@@ -18,7 +18,7 @@
 
 	verb/rename_gun()
 		set name = "Name Gun"
-		set desc = "Click to rename your gun. If you're the detective."
+		set desc = "Click to rename your gun."
 
 		var/mob/M = usr
 		if(!M.mind)	return 0