Various integration things

* Install owncloudsyncd autostart
* Remove dialog from plasmoid
* add OwncloudSettings::openConfig() invokable
* clean up some unneeded cruft
openCOnfig: active-settings or kcmshell4

If the active-settings executable exists, we run that, otherwise, we
fall back to kcmshell4.
default to build plasma client
update todo