Added keyboard input handling

Windows only

base/vulkanexamplebase.h

@@ -391,6 +391,10 @@ public:
 
 	/** @brief (Virtual) Called when the UI overlay is updating, can be used to add custom elements to the overlay */
 	virtual void OnUpdateUIOverlay(vks::UIOverlay *overlay);
+
+#if defined(_WIN32)
+	virtual void OnHandleMessage(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
+#endif
 };
 
 // OS specific macros for the example main entry points