Add "Reduced motion scrolling" option

[Manhhao]

This was suggested on Discord and I thought it'd be pretty cool. Especially useful on ereaders and would make scrolling through definitions on higher quality modes feel a lot better.

It doesn't exactly scroll by popup height, there is a small overlap to kind of help with orientation.

I wasn't sure where to place the checkbox, so it's currently under "Popup Behaviour" as an advanced option.

scroll.mp4

[github-actions]

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[Kuuuube]

Should mention in the setting description that it's useful for e-readers or e-ink displays.

Also not sure I like the name of this setting. Are there other programs that also call this type of thing paginated scrolling?

[Manhhao]

I don't like the name much either, but I also couldn't come up with a different name. If I were to make the jump amount configurable, something like "Scroll override" could work? Other programs just call this pagination, but this isn't really true pagination.

E: This is apparently called "Scrolling by a screenful", so something like "Screenful scrolling" could also work?

[Kuuuube]

"Screenful scrolling" sounds even worse.

How about "Reduced motion scrolling"? If "Paginated Scrolling" is a common term for this maybe note that in the setting description so it can be found with ctrl+f. Along with my previous suggestion about mentioning this setting can help on e-readers.

[Manhhao]

That sounds good, I'll push my changes tomorrow.

[Manhhao]

I've updated the name, description and also exposed both magic numbers as user options. I've also added descriptions to both options. Let me know if anything needs changes.

[Kuuuube]

Very good. One small thing, where you put (in pixels) can you instead put that as a label saying just px ontop of the input box? For reference, some settings such as Horizontal text offset use this styling.

[Kuuuube]

Thank you for the contribution!