Replaces the sticker_domain for Error::domain.

If no name is specified, it'll use the name of the first activity of the
AndroidManifest.xml. And we don't want the apk to be called Settings.apk.

Don't use GLib.

Replaces GLib's g_strsplit().

Prepare for a ICU-based backend without GLib.

libmp4v2 is licensed under MPL 1.1, which is incompatible with GPLv2.
Unfortunately, this means that we must remove the plugin.

More information can be found in the Debian bug report:

 http://bugs.debian.org/767504

Simplify the definition of many build options.

Fixes linker error due to missing "config_domain" symbol.

This reverts commit f0be48ff
(except for the NEWS entry).

If libdispatch (GCD) is used before forking, it
can't safely be used again after forking.

The file systemd/mpd.service.in is being distributed implicitly, but
systemd/mpd.socket is not and needs to be added to EXTRA_DIST.