add lightning API support for mobs

mods/ENVIRONMENT/lightning/init.lua

@@ -156,6 +156,10 @@ lightning.register_on_strike(function(pos, pos2, objects)
 	-- damage nearby objects, transform mobs
 	for _, obj in pairs(objects) do
 		local lua = obj:get_luaentity()
+		if lua and lua._on_strike then
+			lua._on_strike(lua, pos, pos2, objects)
+		end
+		-- remove this when mob API is done
 		if lua and lua.name == "mobs_mc:pig" then
 			mcl_util.replace_mob(obj, "mobs_mc:pigman")
 		elseif lua and lua.name == "mobs_mc:mooshroom" then