Allow movefocus for empty workspaces (#2011)

* Allow switching to empty workspaces using movefocus

* Allow switching to other workspaces when no windows are focused

* Implement review feedback

* Add option to disable focus fallback

* Remove unnecessary braces

src/managers/KeybindManager.hpp

@@ -90,6 +90,8 @@ class CKeybindManager {
     void                      updateXKBTranslationState();
     bool                      ensureMouseBindState();
 
+    static bool               tryMoveFocusToMonitorInDirection(const char&);
+
     // -------------- Dispatchers -------------- //
     static void     killActive(std::string);
     static void     kill(std::string);