New session manager

[Benedikt Meurer]

Hello Xfce world,

I just committed the new session manager code to HEAD. It is not yet in a 
production ready state, but since I'm working on it for over two months now, 
there has to be a point to commit it, or 4.2 will be released in 2010 :-)

The new code is now 100% multihead-safe (both MultiScreen and Xinerama), most 
of the reported bugs are fixed and everything looks better now :)

The problems are currently:

  - smproxy does no longer work with the session manager (so, do _NOT_ launch 
smproxy, it'll cause all kinds of problems). I have to write a multihead safe 
replacement for smproxy, but that'll take some time.
  - Some buggy programs can still crash the sm, I'm on it
  - the interaction sm <-> wm seems to be broken, since xfwm4 does not 
recognize any windows at startup (Olivier, any ideas on this?)
  - the splash window is now yet themable (Note, that from now on, the old 
splash themes are no longer supported), I've talked to Francois about a good 
splash theme solution, but theres nothing in sight yet, but don't worry, it'll 
be ready for 4.2
  - the code and the file formats are not yet frozen, I preserve the right to 
change it if necessary.

So, after all, happy testing (expect bugs :-)

regards,
Benedikt

PS: Olivier, I noticed that there is no way to tell the window manager to keep 
a window on top of all others (the NETWM fullscreen state does not seem to 
work with xfwm4), can you have a look at it. I've currently set the splash 
window OverrideRedirect and manually raises the it every now and then. It'd be 
nice if the window manager could do this instead.

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