Move create_animator and create_weapon into the units module

data/lua/core/units.lua

@@ -70,4 +70,6 @@ if wesnoth.kernel_type() == "Game Lua Kernel" then
 	wesnoth.get_unit = wesnoth.deprecate_api('wesnoth.get_unit', 'wesnoth.units.get', 1, nil, wesnoth.units.get)
 	wesnoth.get_units = wesnoth.deprecate_api('wesnoth.get_units', 'wesnoth.units.find_on_map', 1, nil, wesnoth.units.find_on_map)
 	wesnoth.get_recall_units = wesnoth.deprecate_api('wesnoth.get_units', 'wesnoth.units.find_on_recall', 1, nil, wesnoth.units.find_on_recall)
+	wesnoth.create_animator = wesnoth.deprecate_api('wesnoth.create_animator', 'wesnoth.units.create_animator', 1, nil, wesnoth.units.create_animator)
+	wesnoth.create_weapon = wesnoth.deprecate_api('wesnoth.create_weapon', 'wesnoth.units.create_weapon', 1, nil, wesnoth.units.create_weapon)
 end

src/scripting/game_lua_kernel.cpp

@@ -4114,7 +4114,6 @@ game_lua_kernel::game_lua_kernel(game_state & gs, play_controller & pc, reports
 	// Put some callback functions in the scripting environment.
 	static luaL_Reg const callbacks[] {
 		{ "add_known_unit",           &intf_add_known_unit           },
-		{ "create_animator",          &dispatch<&game_lua_kernel::intf_create_animator>          },
 		{ "eval_conditional",         &intf_eval_conditional         },
 		{ "get_era",                  &intf_get_era                  },
 		{ "get_resource",             &intf_get_resource             },
@@ -4278,6 +4277,7 @@ game_lua_kernel::game_lua_kernel(game_state & gs, play_controller & pc, reports
 		{"find_on_recall", &dispatch<&game_lua_kernel::intf_get_recall_units>},
 		{"get", &dispatch<&game_lua_kernel::intf_get_unit>},
 		{"get_hovered", &dispatch<&game_lua_kernel::intf_get_displayed_unit>},
+		{"create_animator", &dispatch<&game_lua_kernel::intf_create_animator>},
 		{ nullptr, nullptr }
 	};
 	lua_getglobal(L, "wesnoth");

src/scripting/lua_unit_attacks.cpp

@@ -391,7 +391,7 @@ namespace lua_units {
 		lua_setfield(L, -2, "matches");
 
 		// Add create_attack
-		luaW_getglobal(L, "wesnoth");
+		luaW_getglobal(L, "wesnoth", "units");
 		lua_pushcfunction(L, intf_create_attack);
 		lua_setfield(L, -2, "create_weapon");
 		lua_pop(L, 1);