[MIRROR] Removes some easily accessible sources of Mythril (#2090)

* Removes some easily accessible sources of Mythril (#81595)

## About The Pull Request

- Deletes Mythril coins from random spawners, redestributes its weight
where relevant
- Deletes Mythril Sheets from icebox fishing, replaces it with Runite,
which is far less harmful (literally just a strong material)

## Why It's Good For The Game

Mythil's not supposed to be easily player available

Literally the first coin I spawned in testing was summoning, the most
gamebreaking one.

Also see this for more information
tgstation/tgstation#75199 (comment)


![image](https://github.com/tgstation/tgstation/assets/51863163/e5d3b569-4d29-4cd5-bb1e-36f94cbbea84)

With 2 sheets you can farm any prefix you want by combining and
splitting sheets. Nope!

## Changelog

:cl: Melbert
del: Deletes Mythril Coins from random coin spawners
del: Replaces Mythril sheets in icebox vent fishing with Runite sheets
/:cl:

---------



* Removes some easily accessible sources of Mythril

---------

Co-authored-by: NovaBot <[email protected]>
Co-authored-by: MrMelbert <[email protected]>
Co-authored-by: John Willard <[email protected]>

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

@@ -51,14 +51,13 @@
 	loot = list(
 		/obj/item/coin/iron = 5,
 		/obj/item/coin/plastic = 5,
-		/obj/item/coin/silver = 3,
-		/obj/item/coin/plasma = 3,
+		/obj/item/coin/silver = 4,
+		/obj/item/coin/plasma = 4,
 		/obj/item/coin/uranium = 3,
 		/obj/item/coin/titanium = 3,
 		/obj/item/coin/diamond = 2,
 		/obj/item/coin/bananium = 2,
 		/obj/item/coin/adamantine = 2,
-		/obj/item/coin/mythril = 2,
 		/obj/item/coin/runite = 2,
 		/obj/item/food/chococoin = 2,
 		/obj/item/coin/twoheaded = 1,

code/game/objects/structures/maintenance.dm

@@ -24,9 +24,8 @@ at the cost of risking a vicious bite.**/
 		/obj/item/restraints/handcuffs/cable/green = 1,
 		/obj/item/restraints/handcuffs/cable/pink = 1,
 		/obj/item/restraints/handcuffs/alien = 2,
-		/obj/item/coin/bananium = 9,
+		/obj/item/coin/bananium = 10,
 		/obj/item/knife/butcher = 5,
-		/obj/item/coin/mythril = 1,
 	)
 
 

code/modules/fishing/sources/source_types.dm

@@ -233,12 +233,12 @@
 		/obj/item/stack/ore/plasma = 3,
 		/mob/living/basic/mining/lobstrosity = 1,
 		/obj/effect/decal/remains/plasma = 1,
-		/obj/item/stack/sheet/mineral/mythril = 1,
+		/obj/item/stack/sheet/mineral/runite = 1,
 		/obj/item/stack/sheet/mineral/adamantine = 1,
 	)
 	fish_counts = list(
 		/obj/item/stack/sheet/mineral/adamantine = 3,
-		/obj/item/stack/sheet/mineral/mythril = 2,
+		/obj/item/stack/sheet/mineral/runite = 2,
 	)
 
 /datum/fish_source/moisture_trap