[Suggestion] Dynamically resize rewards pane to fit contents

[Exaxxion]

It would be some nice UI polish if the rewards pane could shrink to fit the height of its contents and hide the scrollbar dynamically.

As before, the rewards pane should have a height limit of 50% of the pane and scroll if its contents cannot fit in that space.

[fonnymunkey]

Since it looks like this fork is no longer receiving updates and/or the missing BQTweaker changes aren't wanted, I've went ahead and branched BQTweaker into BQUTweaker to add the missing changes to BQ Unofficial.
https://legacy.curseforge.com/minecraft/mc-mods/bqutweaker
https://github.com/fonnymunkey/BQTweaker/tree/BQUTweaker