This should fix SFTP not working when using GSConnect (which
doesn't specify the SSH parameters we do to allow old cyphers).
Requires API 23, so on pre-23 we still use RSA.
The contacts plugin is the only one that copies (and persists) data to the
remote device just by connecting. By adding this extra confirmation once
per device, we prevent this from happening in cases where someone paired
with a friend to transfer a file, or paired by accident.
As discussed in Matrix and BUG: 474121 this plugin is confusing (because
it doesn't actually take a photo, it just launches the camera on your
phone) and its use case can be covered by taking a photo and sharing it,
which only requires a couple extra clicks.
## Summary
Remove the dead "New Message" notification channel.
This channel was used for a tiny period, probably around 4 years ago, when we thought the only way to support sending MMS on Android was to be the default SMS app, thus we wanted to show users a notification when they received messages while our app was in charge of handling them.
Thankfully, we do not need to be the default SMS app, so this notification channel should be removed.
## Test Plan
### Before:
Looking at the list of notification streams in the settings for KDE Connect will include a "New Message" channel. Notifications are never posted to this channel.
### After:
Users will not see a "New Message" channel. Note that it does show a count of deleted streams, to prevent spam. See [documentation](https://developer.android.com/develop/ui/views/notifications/channels#DeleteChannel) for explanation.
Starting next month (September 2023) it will be required to target
Android 13 to publish to the Play Store.
On Android 13, we need to request the POST_NOTIFICATIONS permission.
This change adds the permission as required/optional to the plugins
that do create notifications. It also adds a popup to request it the
first time you open the app.
Fixes a race condition where onNetworkChange was called before the new
network became the default and the identity packet would be broadcast to
the wrong (e.g. cellular) network.
