Create WindowHandler

include/rewindow/types/window.h

@@ -122,6 +122,28 @@ namespace ReWindow {
         virtual void OnInput(const InputServiceEvent& e) {};
     };
 
+    class WindowHandler {
+    public:
+        WindowHandler() = default;
+    public:
+        void PollEvents();
+        void Refresh();
+        void ManagedRefresh();
+        void UpdateFrameTiming(float frame_time);
+    public:
+        void Raise();
+        void Lower();
+    public:
+        void Fullscreen();
+        void RestoreFromFullscreen();
+    public:
+        void processOnClose();
+        void processOnOpen();
+        void processFocusIn();
+        void processFocusOut();
+        void processOnInput();
+    };
+
 
 
     // This may be better split into multiple component classes.