Add TARGET_USERNAME variable to define username on target distro. Layer can be now used by others also.

libsailfishkeyprovider: Only compile the lib to reduce the amount of weird linking errors (eg: with tests)

user services: Rework the way ceres services are launched in a cleaner systemd-wide way. This also makes those recipes less asteroid-spcecific for systems with a different username.

nemo-qml-plugin-systemsettins: Provide /etc/location/location.conf instead of geoclue-provider-hybris

abootimg, mkbootimg, mkboot, statefs, timed: Use the new pkg_postinst_ontarget syntax of OE sumo instead of the previously used failing pkg_postinst

ngfd: alarm: Use new ngfd 1.0 file format to refer to the 'clock' vibrations. An incorrect configuration file would make ngfd sigsegv and prevent it from working

nemo-qml-plugin-systemsettings: Bump SRCREV and adapt patches and QML import path to the new Nemo.Abc norm