Not yet perfect. Sometimes the unlock window is captured as well
Multi window shot not working...
Captuering all below filtered out windows:

- All loginwindow and ScreenSaverEngine windows are filtered out.
- All below max windowLevel of the filtered out windows are captured
Memory leak eliminated
Not updating the image
Also maxing windowLevel:

Sometimes there are windows with the same windowLevel, thus, maxing also
the windowId.