New clock plugin in xfce4-panel trunk

[Brian J. Tarricone]

Nick Schermer wrote:

> This also means we can remove the clock code from libxfcegui4 - trunk.
> If nobody has something agains this, I'll remove it in a couple of
> days.

I'm not sure how I feel breaking libgui api/abi (even though most likely 
nobody's using XfceClock), but regardless, if you remove it, remember to 
bump the library's libtool interface version...

	-brian