Ability to edit Station Fallback playlist ID

As per API definition there should be a Station fallback playlist ID provided. There is no option to set this in Steering (nor Dashboard) though.

Right now Engine additionally provide some station fallback based on a local music folder. This might not be the primary solution for all users. https://gitlab.servus.at/autoradio/engine/issues/3

mentioned in issue #32 (closed)

@jackie Probably this is some task also to be meant for Dashboard?

mentioned in issue engine#3 (moved)

added To Do label

In the last Team Talk we decided to skip this, as it's sufficient to define the station fallback locally in the engine.

closed

removed To Do label