This requires a few additions to the GDesktopAppInfo api.

At the same time, drop a bunch of old copy-paste code for
loading icons that does not really add anything over using
GtkIconTheme directly.

Since we are dropping fallback mode, we don't need this dialog
anymore.

This is necessary in order for the fallback dialog to be
activated when we want to show a dialog, and the shell
is not around.

It is not used anymore.

We remove all the fallback dialog code paths from gsm-manager,
and make gsm-shell fall back to the standalone end session dialog
if it can't get a shell proxy.

Turn GsmInhibitDialog into a standalone program that provides
the same EndSessionDialog D-Bus interface as gnome-shell. This
also combines the roles of the inhibit and logout dialogs, so
there is no separate fallback logout dialog anymore.

This makes it easier to test, and make gnome-session smaller

We just use one bit of information here. This is in preparation
for making the fail whale a standalone binary.

This is in preparation of turning it into a separate binary.

Its not needed at all.

It's better for some applications that want to integrate
into GNOME without using D-Bus to launch the inhibitor
directly when they need it, and stop it when they don't.

https://bugzilla.gnome.org/show_bug.cgi?id=687404

A few from new gnome-common, others preexisting.

https://bugzilla.gnome.org/show_bug.cgi?id=687838

gnome-session-inhibit.c: In function ‘main’:
gnome-session-inhibit.c:151:3: warning: implicit declaration of function ‘setlocale’ [-Wimplicit-function-declaration]
gnome-session-inhibit.c:151:3: warning: nested extern declaration of ‘setlocale’ [-Wnested-externs]
gnome-session-inhibit.c:151:14: error: ‘LC_ALL’ undeclared (first use in this function)
gnome-session-inhibit.c:151:14: note: each undeclared identifier is reported only once for each function it appears in

Add GetLocale() function for System Settings to lookup the value
of a particular locale setting, such as the session language.

https://bugzilla.gnome.org/show_bug.cgi?id=685863

This is needed since 3rd party media players can't be bothered
to make a D-Bus call.

hopefully he won't notice

gsm-systemd makes synchronous calls to logind.  These
calls invoke a main loop.  If we've already acquired a name
on the session bus when the main loop is running, then we'll
service that bus name too early.

This commit initializes gsm-system before acquiring a name to
avoid that clash.

https://bugzilla.gnome.org/show_bug.cgi?id=687804

We can just pass NULL everywhere nowadays.

https://bugzilla.gnome.org/show_bug.cgi?id=687067

Just makes the code feel more modern.

https://bugzilla.gnome.org/show_bug.cgi?id=687067

Part of GLib, cleaner, better, faster, reverses male pattern baldness,
etc.

https://bugzilla.gnome.org/show_bug.cgi?id=687067

Needed to use SIGUSR1 with g_unix_signal_add().

https://bugzilla.gnome.org/show_bug.cgi?id=687067

We need to be careful here, since we are getting the system
inhibitor with an async call. By the time we get the reply,
the session inhibitor may have already been dropped again.

https://bugzilla.gnome.org/show_bug.cgi?id=685499