[REFACTOR] made SarosUI a static util class

Put the remaining permission logic into the Permission action.

Change-Id: I823991dcb6ff9173e2e2291d0d5b38bc734495e0
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1668
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>