[Enhancement]: Hotkeys / keyboard shortcuts

[gtTracy]

Environment

Linux (Ubuntu 22.04) - but should apply to any version
VDF 3.0.x daily build from Jul 31

Describe desired feature

A hotkey (keyboard shortcut) to scroll from one group of matches to the next - bringing the next set of matches to the top of the results window (rather than the PageDown key which simply scrolls by the screenful).

Note: A list of existing hotkeys (other than those already defined by the OS) and a description of what they do would also be useful.

What issue does it solve?

This would make it much easier to review groups of matches after running Custom Selection or Expression Builder to make sure that only the intended items were selected (this would also apply to any form of automated selection, but those are the two I am currently experimenting with)