Besides:
* Convert ImplJobSetup to be a class.
* Use ImplJobSetup's setters and getters everywhere
* add some const-correctness at places

Change-Id: I32101048e9be4f3950a4540b0666ed548bbcb211
Reviewed-on: https://gerrit.libreoffice.org/24594Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
Tested-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>