Support digital displays iterating through different modes

The Feature

There are energy meters with digital displays which alternate to display different informations. Eg:

• Value of low tariff
• Value of high tariff
• Time
• ...

They usually automatically iterate through those modes based on a time interval. They usually have a spot on the display which shows the currently showed mode.

There where now several requests for such thing, so we should consider looking into it.

Sources:

• https://github.com/jomjol/AI-on-the-edge-device/discussions/1920

We would need to:

1. do the alignment
2. detect which mode currently is shown.
3. only proceed if we are in the right mode.
4. if not in the right mode, we should try again (not waiting until the next round is up)

This also would allow us to have 2 numbers (eg. for 2 tariffs) which show their information on the same spot. An example for this is the meters as documented in https://www.aew.ch/sites/default/files/2019-06/uebersicht-der-haeufigsten-zaehlertypen-der-AEW.pdf. They switch between the shown tariffs every 15s.