Merge pull request #2 from Morpog/master

[glacierui] stuff for glacier styled lockscreen
[packaging] do not depend on darko

this fake dependency was added in order to have darko always pulled in
so old apps don't look "hollow" (darko provides button backgrounds etc)

now jolla-ambient conflicts with this, so we will remove this dependency,
and if darko deems necessary, will be added to patterns (until darko
gets decommissioned when no old apps left, or other strategy thought out)