Port lots of things that had to wait on alerts

Adds a HUD for observers
Adds a HUD for rigs and mechs
Adds up/down buttons for AI hud
Add more tg style alerts
Fix some bugs with the tg alerts
Improve icon_states usage by caching it
Redo how respawning works, add a button to ghost hud for it

code/game/objects/structures/barsign.dm

@@ -6,7 +6,7 @@
 	var/cult = 0
 
 /obj/structure/sign/double/barsign/proc/get_valid_states(initial=1)
-	. = icon_states(icon)
+	. = cached_icon_states(icon)
 	. -= "on"
 	. -= "narsiebistro"
 	. -= "empty"

code/game/objects/structures/cliff.dm

@@ -114,7 +114,7 @@ two tiles on initialization, and which way a cliff is facing may change during m
 
 	var/subtraction_icon_state = "[icon_state]-subtract"
 	var/cache_string = "[icon_state]_[T.icon]_[T.icon_state]"
-	if(T && subtraction_icon_state in icon_states(icon))
+	if(T && subtraction_icon_state in cached_icon_states(icon))
 		cut_overlays()
 		// If we've made the same icon before, just recycle it.
 		if(cache_string in GLOB.cliff_icon_cache)

code/game/objects/structures/window.dm

@@ -47,6 +47,9 @@
 		else
 			. += "<span class='notice'>There is a thick layer of silicate covering it.</span>"
 
+/obj/structure/window/examine_icon()
+	return icon(icon=initial(icon),icon_state=initial(icon_state))
+
 /obj/structure/window/take_damage(var/damage = 0,  var/sound_effect = 1)
 	var/initialhealth = health