Mob refactoring.

Updates Bump() code.
Intents now use constants.
Simple animals can now use languages without overriding say().
There is now a difference between being able to smash normal and reinforced walls.
Reworks simple_animal/attackby so that constructs don't need to override it simply to add damage resistance.

code/modules/surgery/surgery.dm

@@ -80,7 +80,7 @@ proc/spread_germs_to_organ(datum/organ/external/E, mob/living/carbon/human/user)
 proc/do_surgery(mob/living/carbon/M, mob/living/user, obj/item/tool)
 	if(!istype(M))
 		return 0
-	if (user.a_intent == "harm")	//check for Hippocratic Oath
+	if (user.a_intent == I_HURT)	//check for Hippocratic Oath
 		return 0
 	var/zone = user.zone_sel.selecting
 	if(zone in M.op_stage.in_progress) //Can't operate on someone repeatedly.
@@ -108,7 +108,7 @@ proc/do_surgery(mob/living/carbon/M, mob/living/user, obj/item/tool)
 					H.update_surgery()
 				return	1	  												//don't want to do weapony things after surgery
 
-	if (user.a_intent == "help")
+	if (user.a_intent == I_HELP)
 		user << "\red You can't see any useful way to use [tool] on [M]."
 		return 1
 	return 0