Code rework of placing things on walls.

Stuff goes under types.
Types have procs.
Never have 500 lines of repeated code again.

I came very close to crying while editing this. You should appreciate
that.

----

This commit entirely reworks how placing things on walls work- Posters
have intentionally been left alone to reduce the amount of lines
changed. With this commit, wall-mounted objects are no longer snowflaked
into the wall file.

code/game/objects/items/mountable_frames/newscaster_frame.dm

@@ -0,0 +1,32 @@
+/obj/item/mounted/frame/newscaster_frame
+	name = "newscaster frame"
+	desc = "Used to build newscasters, just secure to the wall."
+	icon_state = "newscaster"
+	item_state = "syringe_kit"
+	m_amt = 14000
+	g_amt = 8000
+	mount_reqs = list("simfloor", "nospace")
+
+/obj/item/mounted/frame/newscaster_frame/try_build(turf/on_wall, mob/user)
+	if(..())
+		var/turf/loc = get_turf(usr)
+		var/area/A = loc.loc
+		if (!istype(loc, /turf/simulated/floor))
+			usr << "<span class='alert'>Newscaster cannot be placed on this spot.</span>"
+			return
+		if (A.requires_power == 0 || A.name == "Space")
+			usr << "<span class='alert'>Newscaster cannot be placed in this area.</span>"
+			return
+
+		for(var/obj/machinery/newscaster/T in loc)
+			usr << "<span class='alert'>There is another newscaster here.</span>"
+			return
+
+		return 1
+	return
+
+/obj/item/mounted/frame/newscaster_frame/do_build(turf/on_wall, mob/user)
+	var/obj/machinery/newscaster/N = new /obj/machinery/newscaster(get_turf(src), get_dir(on_wall, user), 1)
+	N.pixel_y -= (loc.y - on_wall.y) * 32
+	N.pixel_x -= (loc.x - on_wall.x) * 32
+	qdel(src)