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/projectiles/gun.dm

@@ -90,14 +90,14 @@
 	if(user && user.client && !(A in aim_targets))
 		var/client/C = user.client
 		//If help intent is on and we have clicked on an eligible target, switch to aim mode automatically
-		if(user.a_intent == "help" && isliving(A) && !C.gun_mode)
+		if(user.a_intent == I_HELP && isliving(A) && !C.gun_mode)
 			C.ToggleGunMode()
 
 		if(C.gun_mode)
 			aiming = PreFire(A,user,params) //They're using the new gun system, locate what they're aiming at.
 
 	if (!aiming)
-		if(user && user.a_intent == "help") //regardless of what happens, refuse to shoot if help intent is on
+		if(user && user.a_intent == I_HELP) //regardless of what happens, refuse to shoot if help intent is on
 			user << "\red You refrain from firing your [src] as your intent is set to help."
 		else
 			Fire(A,user,params) //Otherwise, fire normally.
@@ -105,7 +105,7 @@
 /obj/item/weapon/gun/attack(atom/A, mob/living/user, def_zone)
 	if (A == user && user.zone_sel.selecting == "mouth" && !mouthshoot)
 		handle_suicide(user)
-	else if(user.a_intent == "hurt") //point blank shooting
+	else if(user.a_intent == I_HURT) //point blank shooting
 		Fire(A, user, pointblank=1)
 	else
 		return ..() //Pistolwhippin'

code/modules/projectiles/projectile/change.dm

@@ -71,7 +71,7 @@
 		for (var/obj/effect/proc_holder/spell/S in M.spell_list)
 			new_mob.spell_list += new S.type
 
-		new_mob.a_intent = "hurt"
+		new_mob.a_intent = I_HURT
 		if(M.mind)
 			M.mind.transfer_to(new_mob)
 		else

code/modules/projectiles/targeting.dm

@@ -85,7 +85,7 @@
 		return
 	
 	//reflex firing is disabled when help intent is set
-	if (M.a_intent == "help")
+	if (M.a_intent == I_HELP)
 		M << "\red You refrain from firing your [src] as your intent is set to help."
 		return