This restructures the repo to match other Qt modules, like the
Enterprise Controls. It also renames the plugin and usages of its name
in the documentation so that the abbreviated "VKB" is not used
anywhere.

Change-Id: I5de3fc67846a50438e52f4be057abfa0d9be0d91
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>