Planecube Optimizations and Job Security: Part One (#91696)

## About The Pull Request

This is an atomized revival of #82419, with this part containing the
simplest of its features:
- Fixes AO pref refreshing the wrong plane, thus not updating until you
swap bodies
- Removes supermatter's copypasted warp effect
- Culls distortion effects when they're not in use because its a chonky
filter
- Hides the escape menu when its, well, hidden
- Fixes hide_highest_offset not working upon parent's creation (we're so
good at our jobs hell yeah)
- Replaces runechat's AO dropshadow with an outline, because its barely
visible due to low opacity.

## Why It's Good For The Game

Our rendering performance is shit and we need to improve it, and the
first step in this task is optimizing planecube's simplest parts. The
next step is conditional culling, better non-multiz handling and
parallax rework/removal, but all of those need to be atomized as to
prevent the PR from sharing the fate of the original.

## Changelog
🆑
fix: Ambient Occlusion pref should now update immediately upon being
changed, instead of having to swap bodies or waiting for server restart
to get it updated.
code: Slightly improved rendering code/performance just a tiny bit.
/🆑

code/modules/escape_menu/escape_menu.dm

@@ -21,6 +21,8 @@ GLOBAL_LIST_EMPTY(escape_menus)
 /datum/escape_menu
 	/// The client that owns this escape menu
 	var/client/client
+	/// A weakref to the hud this escape menu currently applies to
+	var/datum/weakref/our_hud_ref
 
 	VAR_PRIVATE
 		ckey
@@ -41,6 +43,7 @@ GLOBAL_LIST_EMPTY(escape_menus)
 
 	ckey = client?.ckey
 	src.client = client
+	refresh_hud()
 
 	base_holder = new(client)
 	if(isnull(dim_screen))
@@ -64,11 +67,16 @@ GLOBAL_LIST_EMPTY(escape_menus)
 	QDEL_NULL(base_holder)
 	QDEL_NULL(page_holder)
 
+	var/datum/our_hud = our_hud_ref?.resolve()
+	if(our_hud)
+		REMOVE_TRAIT(our_hud, TRAIT_ESCAPE_MENU_OPEN, ref(src))
+
 	GLOB.escape_menus -= ckey
 
 	var/sound/esc_clear = sound(null, repeat = FALSE, channel = CHANNEL_ESCAPEMENU) //yes, I'm doing it like this with a null, no its absolutely intentional, cuts off the sound right as needed.
 	SEND_SOUND(client, esc_clear)
 	SEND_SOUND(client, 'sound/misc/escape_menu/esc_close.ogg')
+	client = null
 
 	return ..()
 
@@ -84,6 +92,19 @@ GLOBAL_LIST_EMPTY(escape_menus)
 
 	if (menu_page == PAGE_LEAVE_BODY)
 		qdel(src)
+	else
+		// Otherwise our client just switched bodies, let's update our hud
+		refresh_hud()
+
+/datum/escape_menu/proc/refresh_hud()
+	var/datum/old_hud = our_hud_ref?.resolve()
+	if(old_hud)
+		REMOVE_TRAIT(old_hud, TRAIT_ESCAPE_MENU_OPEN, ref(src))
+
+	var/datum/new_hud = client.mob?.hud_used
+	our_hud_ref = WEAKREF(new_hud)
+	if(new_hud)
+		ADD_TRAIT(new_hud, TRAIT_ESCAPE_MENU_OPEN, ref(src))
 
 /datum/escape_menu/proc/show_page()
 	PRIVATE_PROC(TRUE)