Initial Commit for -tg- Mining

I can guarantee this will not compile, very much a WIP and currently
consists of mostly copy+pasting -tg-'s modules/mining folder over ours,
and unticking a few of our own files.

code/modules/mining/machine_input_output_plates.dm

@@ -16,4 +16,14 @@
 	density = 0
 	anchored = 1.0
 	New()
-		icon_state = "blank"
+		icon_state = "blank"
+
+/obj/machinery/mineral
+	var/input_dir = NORTH
+	var/output_dir = SOUTH
+
+/obj/machinery/mineral/proc/unload_mineral(var/atom/movable/S)
+	S.loc = loc
+	var/turf/T = get_step(src,output_dir)
+	if(T)
+		S.loc = T