Driftfin build-56

Changes:

• Player: pressing the remote's Home button while a show was playing left the sound running in the background. Leaving the app now pauses the show and saves your place, so coming back picks up right where you stopped. Pages and dialogs inside the app, like the actor page over the player, don't trigger this - only actually leaving the app does.

Automated build. Unit tests ran in CI, but this build was not run on a TV by CI. Known limits are listed in the README.