System Tray Integration VI - the return of the tray

[Mike Hearn]

Last time I submitted this, it was dropped because of the non-thread
safe global array. Doing some more work on this last night, I realised
it was pointless anyway, as the tray applet will destroy any windows
when it's deleted (ie if you remove it then readd it, we'd have to
reconstruct any tray windows). I talked to andersca - he said that the
EggTrayIcon code doesn't deal with this situation either, and that the
upcoming XFIXES extension would let us deal with that scenario more
intelligently.

Therefore, I removed the relevant code, as it was unlikely to work
properly without a lot more work.

ChangeLog:
Implement support for XEMBED system tray areas
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