Multitool menu.

Begins work on allowing the multitool to modify and alter more equipment than ever.

code/datums/expansions/expansion.dm

@@ -0,0 +1,14 @@
+/datum/expansion
+
+/datum/expansion
+	var/atom/holder = null // The holder
+
+/datum/expansion/New(var/atom/holder)
+	if(!istype(holder))
+		CRASH()
+	src.holder = holder
+	..()
+
+/datum/expansion/Destroy()
+	holder = null
+	return ..()

code/datums/expansions/multitool/multitool.dm

@@ -0,0 +1,2 @@
+/datum/expansion/multitool/proc/interact()
+	return