Update to Sheet Materials

While this doesn't revert all the changes upstream to the mining materials, it does replace most of them with sprites from other servers, which I feel are more appropriate here.

code/game/objects/items/stacks/stack.dm

@@ -12,7 +12,7 @@
 /obj/item/stack
 	gender = PLURAL
 	origin_tech = list(TECH_MATERIAL = 1)
-	icon = 'icons/obj/stacks.dmi'
+	icon = 'icons/obj/stacks_ch.dmi' //CHOMPedit - materials update
 	randpixel = 7
 	center_of_mass = null
 	var/list/datum/stack_recipe/recipes
@@ -282,16 +282,16 @@
 	if(new_amount < 0 || new_amount % 1)
 		stack_trace("Tried to set a bad stack amount: [new_amount]")
 		return 0
-	
+
 	// Clean up the new amount
 	new_amount = max(round(new_amount), 0)
-	
+
 	// Can exceed max if you really want
 	if(new_amount > max_amount && !no_limits)
 		new_amount = max_amount
-	
+
 	amount = new_amount
-	
+
 	// Can set it to 0 without qdel if you really want
 	if(amount == 0 && !no_limits)
 		qdel(src)
@@ -316,7 +316,7 @@
 
 	if (isnull(tamount))
 		tamount = src.get_amount()
-	
+
 	if(tamount < 0 || tamount % 1)
 		stack_trace("Tried to transfer a bad stack amount: [tamount]")
 		return 0
@@ -343,7 +343,7 @@
 	if(tamount < 0 || tamount % 1)
 		stack_trace("Tried to split a bad stack amount: [tamount]")
 		return null
-	
+
 	var/transfer = max(min(tamount, src.amount, initial(max_amount)), 0)
 
 	var/orig_amount = src.amount