Merge pull request #5473 from Anewbe/dirt_part_two

Various things and floors no longer associate with dirt

code/game/turfs/simulated/outdoors/outdoors.dm

@@ -14,6 +14,8 @@ var/list/turf_edge_cache = list()
 	icon_state = null
 	edge_blending_priority = 1
 	outdoors = TRUE					// This variable is used for weather effects.
+	can_dirty = FALSE				// Looks hideous with dirt on it.
+
 	// When a turf gets demoted or promoted, this list gets adjusted.  The top-most layer is the layer on the bottom of the list, due to how pop() works.
 	var/list/turf_layers = list(/turf/simulated/floor/outdoors/rocks)
 

code/game/turfs/simulated/water.dm

@@ -9,6 +9,8 @@
 	edge_blending_priority = -1
 	movement_cost = 4
 	outdoors = TRUE
+	can_dirty = FALSE	// It's water
+
 	var/depth = 1 // Higher numbers indicates deeper water.
 
 /turf/simulated/floor/water/initialize()