added shortcuts management support

TODO: integrate it in YACReader
TODO: add icons for groups
TODO: add conflicts detection
TODO: fix any shortcut used in keyPressEvent
TODO: choose new default shortcuts (F5 update, F11 fullscreen, etc...)

YACReaderLibrary/options_dialog.h

@@ -12,6 +12,8 @@ class OptionsDialog : public YACReaderOptionsDialog
 Q_OBJECT
 	public:
 		OptionsDialog(QWidget * parent = 0);
+signals:
+        void editShortcuts();
 };