Cleaned up use of deprecated APIs in campaign Lua

[ci skip]

data/campaigns/Eastern_Invasion/lua/bandits.lua

@@ -4,7 +4,7 @@
 local helper = wesnoth.require "helper"
 local wml_actions = wesnoth.wml_actions
 local _ = wesnoth.textdomain "wesnoth-ei"
-local T = helper.set_wml_tag_metatable {}
+local T = wml.tag
 
 function wml_actions.spread_bandit_villages(cfg)
 	local x = cfg.x or helper.wml_error("[spread_bandit_villages] missing required x= attribute.")

data/campaigns/Legend_of_Wesmere/lua/wml_tags.lua

@@ -6,8 +6,8 @@ local replace_map = wesnoth.wml_actions.replace_map
 
 local helper = wesnoth.require "helper"
 local wml_actions = wesnoth.wml_actions
-local T = helper.set_wml_tag_metatable {}
-local V = helper.set_wml_var_metatable {}
+local T = wml.tag
+local V = wml.variables
 
 function wesnoth.wml_actions.shift_labels(cfg)
 	for k, v in ipairs(labels) do

data/campaigns/Northern_Rebirth/lua/respawn_utils.lua

@@ -1,5 +1,5 @@
 local helper = wesnoth.require "helper"
-local T = helper.set_wml_tag_metatable {}
+local T = wml.tag
 
 function wesnoth.wml_actions.find_respawn_point(cfg)
 	local respawn_near = cfg.respawn_near or helper.wml_error "[find_respawn_point] missing required respawn_near= key"

data/campaigns/The_Hammer_of_Thursagan/lua/spawns.lua

@@ -3,7 +3,7 @@
 local helper = wesnoth.require "helper"
 local utils = wesnoth.require "wml-utils"
 local wml_actions = wesnoth.wml_actions
-local T = helper.set_wml_tag_metatable {}
+local T = wml.tag
 
 function wml_actions.spawn_units(cfg)
 	local x = cfg.x or helper.wml_error("[spawn_units] missing required x= attribute.")

data/campaigns/tutorial/lua/character_selection.lua

@@ -4,7 +4,7 @@
 -- for the tutorial
 
 local helper = wesnoth.require "helper"
-local T = helper.set_wml_tag_metatable {}
+local T = wml.tag
 local wml_actions = wesnoth.wml_actions
 local _ = wesnoth.textdomain "wesnoth-tutorial"