make ghast firing more MC-like

mods/ENTITIES/mcl_mobs/api.lua

@@ -2819,6 +2819,10 @@ local do_states = function(self, dtime)
 					local arrow, ent
 					local v = 1
 					if not self.shoot_arrow then
+						self.firing = true
+						minetest.after(1, function()
+							self.firing = false
+						end)
 						arrow = minetest.add_entity(p, self.arrow)
 						ent = arrow:get_luaentity()
 						if ent.velocity then

mods/ENTITIES/mobs_mc/ghast.lua

@@ -63,6 +63,15 @@ mobs:register_mob("mobs_mc:ghast", {
 	makes_footstep_sound = false,
 	instant_death = true,
 	fire_resistant = true,
+	do_custom = function(self)
+		if self.firing == true then
+			self.base_texture = {"mobs_mc_ghast_firing.png"}
+			self.object:set_properties({textures=self.base_texture})
+		else
+			self.base_texture = {"mobs_mc_ghast.png"}
+			self.object:set_properties({textures=self.base_texture})
+		end
+	end,
 })