[Qt] Trying to implement Trayicon for Qt

[Felipe Monteiro de Carvalho]

> gtk and gtk2 = X11 (some other parts of gtk widgetset uses same assumption)
> win32 = win32
> wince = wince
> carbon = carbon
> and qt has own implementation.

If you think of it this way, it can actually be implemented once per widgetset.

But some combinations theorically possible would be left out, like
gtk2 in Mac OS X, which even thougth having X11, doesn't have a X11
tray.

You can propose this on lazarus-dev

-- 
Felipe Monteiro de Carvalho