use shortcut manager for the debug menu * main-window.cc (add_action): new function for adding actions to menus and setting Qt::ApplicationShortcut to the actions; (construct_debug_menu_item): do not set shortcuts but the slot here; (construct_debug_menu): update calls to construct_debug_menu_item; (set_global_shortcuts): set the shortcut for the actions and the settings key * main-window.h: new function add_action, changed paramters of construct_debug_menu_item * shortcut-manager.cc (do_init_data): init the shortcuts for the debug menus

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