Remove g_type_init(), bump GLib required version
remove deprecated librsvg/rsvg-cairo.h include

Direct include of librsvg/rsvg-cairo.h has been deprecated from
2.36.2 version. Removed it and added required version for librsvg.
Use "GNOME Flashback (Metacity)" as a display name for session.

Instead of just "GNOME Flashback". Also, rename gnome-fallback.desktop.in.in
to gnome-flashback.desktop.in.in for consistency and run a sed on all .po
files to use the new file name.
Pass --session-name from desktop files.

And not from a wrapper script. This way we have less code and are able to specify
custom session names when needed.
Add Mutter session.
Add Compiz session.
port bindings to gsettings
panel: create better applet/object names