WIP: Pkglists options
Add options for pkglists.
Companion MR https://gitlab.labs.nic.cz/turris/turris-build/merge_requests/51
Implements parts of https://gitlab.labs.nic.cz/turris/turris-os-packages/issues/500
Implements https://gitlab.labs.nic.cz/turris/turris-os-packages/issues/557
Edited by Karel Koci