## Summary
Start a conversation with contacts having no previous conversation with.
It is currently only possible to use the messaging app to send a message to a conversation which already exists.
This patch implements this feature by integrating all contacts having no prior conversation with the recent conversations in the recent conversation list and at the bottom in a sorted manner, something like this,
The contacts are stored in the recent conversation list model as a conversation but with INVALID conversation ID and INVALID conversation DATE.
## Testing
Testing just needs kdeconnect daemon to be recompiled and executed.
## Summary
Upgrade the SMS App to handle multitarget addresses in the "addresses" field of a message and drop usage of the "address" field
Also note that this has all the commits from https://invent.kde.org/kde/kdeconnect-kde/merge_requests/97, but I will rebase those away once that patch is landed
Bonus: Image composition for multitarget conversations
## Test Plan
- Apply Android-side patch https://invent.kde.org/kde/kdeconnect-android/merge_requests/80
- Launch SMS App
- Notice that you can see all the recipients of multitarget messages. (Replying still not supported, but might get implemented as part of fixing replying to single-target messages)
