prefs: add beta switch and g+ link

Semi automatic beta channel switching inbuilt, so its easier
for users to switch.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>
hotplug: support another hotplug driver

Right of the box another hotplug driver is now supported.
This small interface can be extended in the future to
support more drivers if desired.

Signed-off-by: Blechd0se <alex.christ@hotmail.de>