Utils: Pass const values by reference

Change-Id: Iafd0f372f02f0f3759419a632e81325484861ba1
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Core: Avoid repetitive calls

Change-Id: I7402a3b437038820c27828f0308f37d20754f13b
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Help: Pass const list by reference

Change-Id: I00ece6d5c41a9067bd12b388bf9ca5f80e981ed6
Reviewed-by: Eike Ziller <eike.ziller@digia.com>