The Glitterening (#92226)

## About The Pull Request

Adds a number of new capabilities to glitter.

- It can be any colour.
<img width="657" height="398" alt="image"
src="https://github.com/user-attachments/assets/60e80c04-8eee-470c-8953-47f6eda9f83e"
/>

- It can be made in chemistry and dyed by combining it with acetone and
other reagents to give it the average colour of the non-glitter,
not-acetone reagents.
- Multiple colours can be mixed into one reagent datum, randomly
depositing a colour from those in the datum on the floor.
<img width="554" height="507" alt="image"
src="https://github.com/user-attachments/assets/9cc7d1d5-9bec-4b28-af06-310ffb24de49"
/>

- Anyone with glitter reagent in them will cough glitter onto the floor
- Glittery crates will leave a trail of appropriately coloured glitter
when moved
<img width="960" height="259" alt="image"
src="https://github.com/user-attachments/assets/71cc1176-23f9-4ae7-b500-1744b752c014"
/>

Resprited glitter to support these changes and make it not look like gas
(or ass).

## Why It's Good For The Game

It looks cool and raises the bar for chemists maximally pissing off the
janitor as they fill a room with multicoloured glitter and all the
occupants run off to cough more up all over the surrounding area.

## Changelog
🆑
add: Glitter can now be made from plastic polymers and aluminium.
add: Plastic polymer can be made at any temperature, and then heated to
produce sheets.
add: Glitter can now be made any colour, mix 10 units each of glitter
and acetone to change its colour to that of the other reagents in the
beaker.
add: Mixing different colours of glitter will cause a random selection
of those colours to appear on the floor when released.
add: Being exposed to glitter in reagent form causes you to cough up
more glitter onto the floor
add: Dragging glittery crates will now spread a trail of glitter and
angry janitors behind them.
image: Added new glitter sprites (that don't look like gasses)
/🆑

code/game/objects/effects/decals/cleanable.dm

@@ -134,3 +134,7 @@
 	if (existing)
 		return existing
 	return new cleanable_type(checkturf)
+
+/turf/proc/spawn_glitter(glitter_colors)
+	var/obj/effect/decal/cleanable/glitter/new_glitter = spawn_unique_cleanable(/obj/effect/decal/cleanable/glitter)
+	new_glitter.color = pick_weight(glitter_colors)

code/game/objects/effects/decals/cleanable/misc.dm

@@ -294,22 +294,14 @@ GLOBAL_LIST_EMPTY(nebula_vomits)
 /obj/effect/decal/cleanable/glitter
 	name = "generic glitter pile"
 	desc = "The herpes of arts and crafts."
-	icon = 'icons/effects/atmospherics.dmi'
-	icon_state = "plasma_old"
+	icon = 'icons/effects/glitter.dmi'
+	icon_state = "glitter"
 	gender = NEUTER
 	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
 
-/obj/effect/decal/cleanable/glitter/pink
-	name = "pink glitter"
-	icon_state = "plasma"
-
-/obj/effect/decal/cleanable/glitter/white
-	name = "white glitter"
-	icon_state = "nitrous_oxide"
-
-/obj/effect/decal/cleanable/glitter/blue
-	name = "blue glitter"
-	icon_state = "freon"
+/obj/effect/decal/cleanable/glitter/Initialize(mapload, list/datum/disease/diseases)
+	. = ..()
+	add_overlay(mutable_appearance('icons/effects/glitter.dmi', "glitter_sparkle[rand(1,9)]", appearance_flags = EMISSIVE_APPEARANCE_FLAGS))
 
 /obj/effect/decal/cleanable/plasma
 	name = "stabilized plasma"

code/game/objects/effects/spawners/random/entertainment.dm

@@ -294,6 +294,6 @@
 	loot = list(
 		/obj/item/grenade/chem_grenade/glitter/pink,
 		/obj/item/grenade/chem_grenade/glitter/blue,
-		/obj/item/grenade/chem_grenade/glitter/white,
+		/obj/item/grenade/chem_grenade/glitter,
 		/obj/item/grenade/chem_grenade/colorful
 	)