dialogs → multiplayer Relation

File in gui/dialogs	Includes file in gui/dialogs/multiplayer
preferences_dialog.cpp	mp_alerts_options.hpp
sp_options_configure.hpp	mp_options_helper.hpp
sp_options_configure.hpp	plugin_executor.hpp
title_screen.cpp	mp_host_game_prompt.hpp
title_screen.cpp	mp_method_selection.hpp