Use glib-mkenums to generate enum types
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.
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