Progress bars + Wall Rationalization

This commit does the following:
 - Ports progress bars from -tg- (tgstation/-tg-station#9921)
 - Refactors wall attackby code to make it 100% less insane; Instead of
   manually checking every little thing, it uses do_after,
   consequentially, making the new progress bars affect dealing with walls
   as well.

Wall code makes a tiger sad.

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

@@ -131,7 +131,7 @@
 			return
 		if (R.time)
 			usr << "\blue Building [R.title] ..."
-			if (!do_after(usr, R.time))
+			if (!do_after(usr, R.time, target = src))
 				return
 		if (src.amount < R.req_amount*multiplier)
 			return