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Now an invitiation was answered when it is no longer available

This was done, so private responses don't need to include a Nameable already.
Retreiving a nameable is tricky and requires a data migration,
so we just don't do it now.

This removes the public method for retrieving messages
from individual conversation clients
and just leaves methods that require a transaction
to be used by the ConversationManager only.

This also adds `Shareable`s to invitation response
which is a precondition for #561

Add warning to FLAG_SECURE about app locking implications

Closes #1247

See merge request briar/briar!922

Correct startup database failure error messages

Closes #1379

See merge request briar/briar!920

Fix progress feel over messages in Conversation view

Closes #1359

See merge request briar/briar!911

Fix duplicate actions triggered by hardware keyboard

Closes #1367

See merge request briar/briar!921

Fixes #1367

Specify optional tests with an environment variable

See merge request briar/briar!916

Launch SetupActivity in same task to prevent relaunching from recent apps

Closes #1189

See merge request briar/briar!919

Enable sign-in reminder, PIN lock and dark theme for release builds

See merge request briar/briar!917

Screenshots for account sign-in improvements and Tor settings

See merge request briar/briar!909

Attach updated settings to SettingsUpdatedEvent

See merge request briar/briar!913