Random mineral spawns change less turfs. (#49205)

As-is, random mineral spawning changes the turf to the subtype with that mineral, which results in a lot of turf changes I guess. Now it just changes the mineralType of the turf. Unless it's gibtonite or a cave spawner, because the alternatives are worse and those aren't all that common anyway.

🆑
tweak: Random mineral turfs no longer cause large amounts of turf changes on initialization.
/🆑

code/modules/mining/ores_coins.dm

@@ -19,6 +19,8 @@
 	var/mine_experience = 5 //How much experience do you get for mining this ore?
 	novariants = TRUE // Ore stacks handle their icon updates themselves to keep the illusion that there's more going
 	var/list/stack_overlays
+	var/scan_state = "" //Used by mineral turfs for their scan overlay.
+	var/spreadChance = 0 //Also used by mineral turfs for spreading veins
 
 /obj/item/stack/ore/update_overlays()
 	. = ..()
@@ -74,6 +76,8 @@
 	custom_materials = list(/datum/material/uranium=MINERAL_MATERIAL_AMOUNT)
 	refined_type = /obj/item/stack/sheet/mineral/uranium
 	mine_experience = 6
+	scan_state = "rock_Uranium"
+	spreadChance = 5
 
 /obj/item/stack/ore/iron
 	name = "iron ore"
@@ -84,6 +88,8 @@
 	custom_materials = list(/datum/material/iron=MINERAL_MATERIAL_AMOUNT)
 	refined_type = /obj/item/stack/sheet/metal
 	mine_experience = 1
+	scan_state = "rock_Iron"
+	spreadChance = 20
 
 /obj/item/stack/ore/glass
 	name = "sand pile"
@@ -139,6 +145,8 @@ GLOBAL_LIST_INIT(sand_recipes, list(\
 	custom_materials = list(/datum/material/plasma=MINERAL_MATERIAL_AMOUNT)
 	refined_type = /obj/item/stack/sheet/mineral/plasma
 	mine_experience = 5
+	scan_state = "rock_Plasma"
+	spreadChance = 8
 
 /obj/item/stack/ore/plasma/welder_act(mob/living/user, obj/item/I)
 	to_chat(user, "<span class='warning'>You can't hit a high enough temperature to smelt [src] properly!</span>")
@@ -154,6 +162,8 @@ GLOBAL_LIST_INIT(sand_recipes, list(\
 	mine_experience = 3
 	custom_materials = list(/datum/material/silver=MINERAL_MATERIAL_AMOUNT)
 	refined_type = /obj/item/stack/sheet/mineral/silver
+	scan_state = "rock_Silver"
+	spreadChance = 5
 
 /obj/item/stack/ore/gold
 	name = "gold ore"
@@ -164,6 +174,8 @@ GLOBAL_LIST_INIT(sand_recipes, list(\
 	mine_experience = 5
 	custom_materials = list(/datum/material/gold=MINERAL_MATERIAL_AMOUNT)
 	refined_type = /obj/item/stack/sheet/mineral/gold
+	scan_state = "rock_Gold"
+	spreadChance = 5
 
 /obj/item/stack/ore/diamond
 	name = "diamond ore"
@@ -174,6 +186,7 @@ GLOBAL_LIST_INIT(sand_recipes, list(\
 	custom_materials = list(/datum/material/diamond=MINERAL_MATERIAL_AMOUNT)
 	refined_type = /obj/item/stack/sheet/mineral/diamond
 	mine_experience = 10
+	scan_state = "rock_Diamond"
 
 /obj/item/stack/ore/bananium
 	name = "bananium ore"
@@ -184,6 +197,7 @@ GLOBAL_LIST_INIT(sand_recipes, list(\
 	custom_materials = list(/datum/material/bananium=MINERAL_MATERIAL_AMOUNT)
 	refined_type = /obj/item/stack/sheet/mineral/bananium
 	mine_experience = 15
+	scan_state = "rock_Bananium"
 
 /obj/item/stack/ore/titanium
 	name = "titanium ore"
@@ -194,6 +208,8 @@ GLOBAL_LIST_INIT(sand_recipes, list(\
 	custom_materials = list(/datum/material/titanium=MINERAL_MATERIAL_AMOUNT)
 	refined_type = /obj/item/stack/sheet/mineral/titanium
 	mine_experience = 3
+	scan_state = "rock_Titanium"
+	spreadChance = 5
 
 /obj/item/stack/ore/slag
 	name = "slag"