performances improvement in mcl_void_damage

cache global functions

mods/ENVIRONMENT/mcl_void_damage/init.lua

@@ -1,6 +1,12 @@
 local S = minetest.get_translator("mcl_void_damage")
 local enable_damage = minetest.settings:get_bool("enable_damage")
 
+local pos_to_dim = mcl_worlds.pos_to_dimension
+local dim_change = mcl_worlds.dimension_change
+local is_in_void = mcl_worlds.is_in_void
+local get_spawn_pos = mcl_spawn.get_player_spawn_pos
+local death_msg = mcl_death_messages.player_damage
+
 local voidtimer = 0
 local VOID_DAMAGE_FREQ = 0.5
 local VOID_DAMAGE = 4
@@ -33,7 +39,7 @@ minetest.register_on_mods_loaded(function()
 			self._void_timer = 0
 
 			local pos = obj:get_pos()
-			local void, void_deadly = mcl_worlds.is_in_void(pos)
+			local void, void_deadly = is_in_void(pos)
 			if void_deadly then
 				local ent = obj:get_luaentity()
 				obj:remove()
@@ -55,7 +61,7 @@ minetest.register_globalstep(function(dtime)
 		for p=1, #players do
 			local player = players[p]
 			local pos = player:get_pos()
-			local void, void_deadly = mcl_worlds.is_in_void(pos)
+			local void, void_deadly = is_in_void(pos)
 			if void_deadly then
 				local immortal_val = player:get_armor_groups().immortal
 				local is_immortal = false
@@ -65,14 +71,14 @@ minetest.register_globalstep(function(dtime)
 				if is_immortal or not enable_damage then
 					-- If damage is disabled, we can't kill players.
 					-- So we just teleport the player back to spawn.
-					local spawn = mcl_spawn.get_player_spawn_pos(player)
+					local spawn = get_spawn_pos(player)
 					player:set_pos(spawn)
-					mcl_worlds.dimension_change(player, mcl_worlds.pos_to_dimension(spawn))
+					dim_change(player, pos_to_dim(spawn))
 					minetest.chat_send_player(player:get_player_name(), S("The void is off-limits to you!"))
 				elseif enable_damage and not is_immortal then
 					-- Damage enabled, not immortal: Deal void damage (4 HP / 0.5 seconds)
 					if player:get_hp() > 0 then
-						mcl_death_messages.player_damage(player, S("@1 fell into the endless void.", player:get_player_name()))
+						death_msg(player, S("@1 fell into the endless void.", player:get_player_name()))
 						player:set_hp(player:get_hp() - VOID_DAMAGE)
 					end
 				end