Add E-Ink options to DisplayConfig

[todd-herbert]

Intention is to expose two new settings to users:

• E-Ink Screensaver: what behavior to use when display updates are paused
• E-Ink Full Sun: slower, more robust. Hopes to improve outdoor performance for some displays

Neither of these features are implemented just yet. Screensaver code is a work-in-progress: meshtastic/firmware#3477

Changes tested locally with the python CLI; unsure what work is necessary to eventually expose the new settings in the mobile apps / Web UI.

[caveman99]

Technically that would be fine. Then again we wanted to reduce the settings, not add to them. I sense a bit of feature creep here. The direct sunlight mode is sensible, for the screensaver i'd scrap the configuration option, just pick one and use that. It's nothing that will destroy UX too badly. What abut flying 3d meshtastic logos? ;-)

[todd-herbert]

I hear you. This was a reaction to feedback on the initial screensaver pull request, essentially a difference of opinion on aesthetics. The hope here was that no users gets stuck with a feature they are unhappy about. Definitely a bit of feature creep though, and yeah possibly a step too far.

Personally, after implementing the different options yesterday, I have come around and probably now prefer the subtle overlay option suggested on the firmware pull-request.

[todd-herbert]

I will still look into the full-sun config option in the near future.