- simple_animals can't open doors by default

- alien larvae, mice can hide under mobs
- roaches, mice can hide under various objects
- various tweaks, including flavour and existing mechanics
- fix for ghosts not being able to spawn as mice
- added move delay of half a second to simple_animals (about the same as human walkspeed?)
- simple_animals, when talking, can only understand each other (and mobs with universal_speak)

Signed-off-by: Cael_Aislinn <cael_aislinn@yahoo.com.au>

code/modules/critters/critters.dm

@@ -164,7 +164,7 @@
 	atkcarbon = 1
 	atksilicon = 0
 	attacktext = "bites"
-	layer = 2.1		//so they can hide under objects
+	layer = 2.5		//so they can hide under objects
 
 	Bump(var/mob/M)
 		if(ishuman(M))