With #5116 removing the `verificationRequestAccepted` view state and its
`.startSasVerification` button action we now need another way of starting the SAS
flows whenever the verification requests gets accepted. As such a state machine
transition from `acceptingVerificationRequest` to `verificationRequestAccepted`
will now automatically call `startSasVerification` on the SessionVerificationProxy.
* session verification now does not have a waiting screen, but the initial state instead presents a loading state. Everything is also handled with one single action
* use progress view in place of the spinner icon
* change progress view tint
* Fixes#1227 - Add support for receiving and interacting with incoming session verification requests.
* Fix a couple of random small warnings
* Move static view config to the view state
* Update snapshots
