Make setting type registration less icky; instead of having the
connection register all the settings, have the settings themselves
register that information at library load time. Putting this sort
of thing in G_DEFINE_TYPE_WITH_CODE is apparently more standard
than the home-rolled stuff we had before. Also document the
priority stuff so when adding new settings, people know what
priority to use.
(cleanups by jklimes)
Rather than generating enum classes by hand (and complaining in each
file that "this should really be standard"), use glib-mkenums.
Unfortunately, we need a very new version of glib-mkenums in order to
deal with NM's naming conventions and to fix a few other bugs, so just
import that into the source tree temporarily.
Also, to simplify the use of glib-mkenums, import Makefile.glib from
https://bugzilla.gnome.org/654395.
To avoid having to run glib-mkenums for every subdirectory of src/,
add a new "generated" directory, and put the generated enums files
there.
Finally, use Makefile.glib for marshallers too, and generate separate
ones for libnm-glib and NetworkManager.
