common: flesh out enum lab_edge and prefer over wlr_edges/wlr_direction

I like the new common/edge.h. I don't like how inconsistently we use it.

Current situation:

 - enum wlr_edges and wlr_direction are designed to be used as bitset,
   and are defined compatibly

 - enum lab_edge is *also* designed to be used as bitset, but
   incompatible with the others (LEFT/RIGHT come before UP/DOWN)

 - we use an inconsistent mix of all three *AND* uint32_t (usually with
   the WLR_EDGE constants rather than the LAB_EDGE constants), and
   convert between them on an ad-hoc basis, sometimes implicitly

Let's clean this up:

 - reorder enum lab_edge to be compatible with the two wlr enums
   (check this by static_assert)

 - use TOP/BOTTOM naming rather than UP/DOWN (matches wlr_edges)

 - add constants for the remaining possible combinations of the 4 edges

 - use lab_edge for all internal edge/direction fields, consistently

 - add lab_edge_is_cardinal() as a sanity check before casting to
   enum wlr_direction, and then eliminate all of direction.c/h

Instead of "enum wlr_edges direction", we now have
"enum lab_edge direction" which is not that much better. At least we
are now clear that we're overloading one enum with two meanings.

src/xwayland.c

@@ -280,7 +280,7 @@ handle_request_move(struct wl_listener *listener, void *data)
 	 */
 	struct view *view = wl_container_of(listener, view, request_move);
 	if (view == view->server->seat.pressed.view) {
-		interactive_begin(view, LAB_INPUT_STATE_MOVE, 0);
+		interactive_begin(view, LAB_INPUT_STATE_MOVE, LAB_EDGE_NONE);
 	}
 }