[REFACTOR] Move exceptions package to core

Change-Id: I6dd15541f261c9e4755b0c9fe6732163b844ecbe
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1492
Tested-by: Jenkins CI
Reviewed-by: Arndt Lasarzik <alasarzik@gmail.com>
Reviewed-by: Maria Formisano <maria@formisano.me>
Reviewed-by: Andrej Szaffranietz <a.szaffranietz@gmail.com>
Reviewed-by: Franz Zieris <zieris@inf.fu-berlin.de>