Make sure talk_wheel_icon var is properly deleted when hud is deleted.

Add a hotkey for the talk wheel: H (hotkey mode) and Ctrl+H.
Fixes not being able to use the wheel and talk button while stunned.

code/modules/mob/mob_helpers.dm

@@ -464,3 +464,14 @@ It's fairly easy to fix if dealing with single letters but not so much with comp
 		M << "There were no ghosts willing to take control."
 		message_admins("No ghosts were willing to take control of [key_name_admin(M)])")
 		return FALSE
+
+//toggles the talk wheel
+/mob/verb/toggle_talk_wheel()
+	set name = "talk-wheel"
+	set hidden = 1
+
+	if(ishuman(src))
+		var/mob/living/carbon/human/H = src
+		if(H.hud_used && H.hud_used.talk_wheel_icon)
+			H.hud_used.talk_wheel_icon.Click()
+