[Qt] Qt tray icon

[Felipe Monteiro de Carvalho]

Hi Philip,

Can you test now the magnifier with latest lazarus? I did a basic
trayicon implementation for Qt

By the way, in doing so I noticed that QSystemTrayIcon from Qt is
extremely limited and is not enougth to implement a very large portion
of TTrayIcon .... in the future a Cocoa implementation will be
necessary. So far we were talking about Carbon, but the reality is
that Carbon doesn't provide any way to interract with the menu extras.
Cocoa API is the one that does.

thanks,
-- 
Felipe Monteiro de Carvalho