Every QR scanner now recognises every kind of code the app uses —
connection links, server addresses, migration links, desktop addresses
and a contact's security code — instead of only the one kind its screen
expects. When a code of the wrong kind is scanned, one shared alert says
what it is (a complete sentence) and where to scan it, and offers to
connect directly when it is a connection link. A single sealed type, one
classifier and one alert serve every screen on Android, desktop and iOS.
* ios: verify connection security code
* verification in member sheet (still crashes)
* use navigation view for members list
* ios: show verified status in the lists
* update verification status in the list of members
* verified shield layout
* update icon, make add member navigation to right
* refactor chatPreviewTitle