use mcl_util.replace_mob function to simplify lightning code

mods/ENVIRONMENT/lightning/init.lua

@@ -128,8 +128,6 @@ function lightning.strike(pos)
 	end
 end
 
-
-
 lightning.register_on_strike(function(pos, pos2, objects)
 	local particle_pos = vector.offset(pos2, 0, (lightning.size / 2) + 0.5, 0)
 	local particle_size = lightning.size * 10
@@ -158,13 +156,8 @@ lightning.register_on_strike(function(pos, pos2, objects)
 	-- damage nearby objects, transform mobs
 	for _, obj in pairs(objects) do
 		local lua = obj:get_luaentity()
-		-- pig → zombie pigman (no damage)
 		if lua and lua.name == "mobs_mc:pig" then
-			local rot = obj:get_yaw()
-			obj:remove()
-			obj = add_entity(pos2, "mobs_mc:pigman")
-			obj:set_yaw(rot)
-			-- mooshroom: toggle color red/brown (no damage)
+			mcl_util.replace_mob(obj, "mobs_mc:pigman")
 		elseif lua and lua.name == "mobs_mc:mooshroom" then
 			if lua.base_texture[1] == "mobs_mc_mooshroom.png" then
 				lua.base_texture = { "mobs_mc_mooshroom_brown.png", "mobs_mc_mushroom_brown.png" }
@@ -172,23 +165,10 @@ lightning.register_on_strike(function(pos, pos2, objects)
 				lua.base_texture = { "mobs_mc_mooshroom.png", "mobs_mc_mushroom_red.png" }
 			end
 			obj:set_properties({ textures = lua.base_texture })
-		-- villager → witch (no damage)
-		-- elseif lua and lua.name == "mobs_mc:villager" then
-		-- Witches are incomplete, this code is unused
-		-- TODO: Enable this code when witches are working.
-		--[[
-			local rot = obj:get_yaw()
-			obj:remove()
-			obj = minetest.add_entity(pos2, "mobs_mc:witch")
-			obj:set_yaw(rot)
-		]]
-		-- charged creeper
+		elseif lua and lua.name == "mobs_mc:villager" then
+			mcl_util.replace_mob(obj, "mobs_mc:witch")
 		elseif lua and lua.name == "mobs_mc:creeper" then
-			local rot = obj:get_yaw()
-			obj:remove()
-			obj = add_entity(pos2, "mobs_mc:creeper_charged")
-			obj:set_yaw(rot)
-			-- Other objects: Just damage
+			mcl_util.replace_mob(obj, "mobs_mc:creeper_charged")
 		else
 			mcl_util.deal_damage(obj, 5, { type = "lightning_bolt" })
 		end