Handle incoming calls on lock screen
This is builds on top of !777 (merged) since @tobias.bernard is reworking the 'incoming call when locked' case and this way we have already have most of the code skeleton in place for that. No need to review yet.
- wire up avatar and name label
- wire up callaudiod
- TODOs in source
- add encryption indicator
- adjust to mockups
- disable dialpad or allow DMTF
we'll need to check how close we want to come for an initial merge since calls#107 is worth fixing on its own so e.g. i'd do the swipeable buttons as follow up.