Add HyperSQL as an alternative DB library for testing

See merge request !619

Use namespaced labels for all crypto operations

See merge request !632

Don't remove shutdown hook when closing DB

Closes #1120

See merge request !644

Don't set scene transition for Samsung devices running Android 7.0

Closes #1007

See merge request !640

Replace a few runnables with lambdas

See merge request !638

Change package name, bump expiry date

See merge request !637

Use NotificationChannel for foreground service to avoid crash on Android 8.1

Closes #1124

See merge request !634

This also seems to address #1075 at least on an emulator

Simplify management of old transport property updates

See merge request !629

Don't use ClientId.toString() for signature labels

Closes #1110

See merge request !631

Add support for Ed25519 signatures

See merge request !627

Target API version 26, upgrade support library

See merge request !626