GApplication: parse command line options

Add support for parsing command line options with GApplication.

You can add GOptionGroup and GOptionEntry using two new APIs:
g_application_add_option_group() and
g_application_add_main_option_entries().

Also add a "handle-local-options" signal that allows handling of
commandline arguments in the local process without having to override
local_command_line.

As a special feature, you can have a %NULL @arg_data in a GOptionEntry
which will cause the argument to be stored in a GVariantDict.  This
dictionary is available for inspection and modification by the
"handle-local-options" signal and can be forwarded to the primary
instance in cases of command line invocation (where it can be fetched
using g_application_command_line_get_options()).

https://bugzilla.gnome.org/show_bug.cgi?id=721977

gio/gapplicationcommandline.h

@@ -76,6 +76,9 @@ GLIB_AVAILABLE_IN_ALL
 gchar **                g_application_command_line_get_arguments        (GApplicationCommandLine   *cmdline,
                                                                          int                       *argc);
 
+GLIB_AVAILABLE_IN_2_40
+GVariantDict *          g_application_command_line_get_options_dict     (GApplicationCommandLine   *cmdline);
+
 GLIB_AVAILABLE_IN_2_36
 GInputStream *          g_application_command_line_get_stdin            (GApplicationCommandLine   *cmdline);