Power saving mode

[HT-7]

Is your feature request related to a problem? Please describe.

Animations and loading thumbnails increase power consumption.

Pull-to-refresh is triggered by the same finger movement that is responsible for scrolling up, meaning if you repeat it one time too often, you refresh when you didn't want to. Each unwanted refresh wastes battery power needlessly.

Describe the solution you'd like

This feature should disable transition animations, thumbnails, and the pull-to-refresh gesture, all with a single switch.

A simple button can be used for refreshing if the user wants it.

As an alternative to an app-internal switch, I suggest it to detect when the phone is in power saving mode and then deactivate all non-essential features that consume power (transition animations, thumbnails, pull-to-refresh).

Describe alternatives you've considered
Thumbnails can be disabled in the settings, but there is no feature to disable all non-essential power consuming features.

[HT-7]

I just noticed the "disable animations" part was already suggested at #4314.