Combat mode component. (#12338)

* Combat mode component.

* Whoops.

* test.

* Oh

* refs begone, and documentation.

code/modules/keybindings/keybind/living.dm

@@ -22,12 +22,8 @@
 	full_name = "Toggle combat mode"
 	description = "Toggles whether or not you're in combat mode."
 
-/datum/keybinding/living/toggle_combat_mode/can_use(client/user)
-	return iscarbon(user.mob)		// for now, only carbons should be using combat mode, although all livings have combat mode implemented.
-
 /datum/keybinding/living/toggle_combat_mode/down(client/user)
-	var/mob/living/carbon/C = user.mob
-	C.user_toggle_intentional_combat_mode()
+	SEND_SIGNAL(user.mob, COMSIG_TOGGLE_COMBAT_MODE)
 	return TRUE
 
 /datum/keybinding/living/toggle_resting