[patch] xfce4-session, libxfce4util: xfce4-shutdown features and code reorg

[Brian J. Tarricone]

hello all-

i was bored, so i looked for something non-taxing to hack on.  i added 
three configure options to xfce4-session:
--with-poweroff=...
--with-halt=...
--with-reboot=...
which allow the user (or, more likely, distro packagers) to substitute 
custom binary/script locations for those 3 functions in xfce4-shutdown.  
the new code first clears all environment variables, sets a safe PATH, 
and then launches the custom command using g_spawn_command_line_sync() - 
this way you can specify a command with arguments and the binary doesn't 
have to worry about splitting them into an argument list for execl().

also, while i was browsing in the session manager directory, i noticed 
two functions with the note "move to libxfce4util," so i did.

    -brian
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