temporarliy got rid of some insane work arounds in favor of some maybe less insane work arounds
auto register/unregister listeners
initial smp support
added snackbar to indicate smp. more error handling in verify activity
small bug fix
use auto register for verify otr listeners
Merge branch 'feature/otr_verification' of https://github.com/siacs/Conversations into feature/otr_verification

Conflicts:
	src/main/java/eu/siacs/conversations/ui/VerifyOTRActivity.java