In-game settings menu using separate Lua environment (#15614)

src/script/CMakeLists.txt

@@ -15,6 +15,7 @@ set(common_SCRIPT_SRCS
 set(client_SCRIPT_SRCS
 	${CMAKE_CURRENT_SOURCE_DIR}/scripting_mainmenu.cpp
 	${CMAKE_CURRENT_SOURCE_DIR}/scripting_client.cpp
+	${CMAKE_CURRENT_SOURCE_DIR}/scripting_pause_menu.cpp
 	${client_SCRIPT_COMMON_SRCS}
 	${client_SCRIPT_CPP_API_SRCS}
 	${client_SCRIPT_LUA_API_SRCS}