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We really don't support them anyway

The window provider can take care of this (tested with Qt4 and XCB
window). X11 forwards unhandled events to ancestor windows.

Windows-specific keys are missing (found in XFree86?).
Mouse wheel is implemented with mouse events (like X11); afterall it is
not on the KEYboard.

The image still misses borders due to Qt4 window provider not returning
the correct height (it pretends the window is bigger than it is).

There is a problem with blending GREY on GREY though.
Use `Xephyr -grayscale` to test.

(X11 has a similar bug, not to how to fix it)

This can really only output iamges at this point.
Critical yet-to-be-implemented features:
 - MIT-SHM shared memory support
 - XVideo hardware scaling & chroma conversion
 - keyboard event handling
 - mouse event handling
 - window (manager) event handling
 - cursor blanking
 - window provider submodule (so it can work without the Qt interface)
 - screen capture access module
 - GLX, perhaps?
 - etc

15, 16 and 24-bits color depth work. 32-bits depth was not tested due
to lack of suitable video adapter. 8-bits depth does not work due to a
bug in VLC chroma handling. B&W, grey and 16 color are not supported,
but are probably not worth it - the Xlib output does not support them
either.

Fullscreen should work, but was not tested.