Created A.reset(), renamed init_map() to reset_map().
Moved more initialization stuffs to A.reset()..
Added new game status GAME_STATUS_MENU, reorganized structure of A.set_status().
Moved A.reset() call into A.set_status().
Added menu graphics and option toggling method A.menu_toggle().
Added handling of "menu" and "options_update".
Added a message when connected to the other player.
The menu is now hidden by default.
menu: Default value for "new level" is now "yes".