refs #233 Keyboard key/key list

* helper methods for keylist (key for function)
* new Hotkey function (toggle window on top)
* improved comparisons for key
* unit tests

src/blackmisc/hwkeyboardkeylist.h

@@ -41,6 +41,8 @@ namespace BlackMisc
             bool containsFunction(CKeyboardKey::HotkeyFunction function) const;
 
             //! Key for given function
+            CKeyboardKey keyForFunction(CKeyboardKey::HotkeyFunction function) const;
+
             //! Register metadata
             static void registerMetadata();