message: Use more specific includes instead of UI.h in MapViewState
diff: #include "../UI/Gui.h"
  #include "../UI/NotificationArea.h"
  #include "../UI/NotificationWindow.h"
  -#include "../UI/UI.h"
  +
  +#include "../UI/Core/WindowStack.h"
  +#include "../UI/Core/ToolTip.h"
  #include <NAS2D/Signal/Signal.h>
  #include <NAS2D/Math/Point.h>
  