Improve column view autoscroll

## Problem

Wanting to just to drag and drop an item from one directory to another has the entire view change, which not only hinders my ability to just move something from A to B, but in most cases only serves as a punishment for misclicking in a directory.
This is made worse by the delay in the before the autoscroll kicks in as the user likely already moved the item over the destination folder.

## Proposal

Replace the click based autoscroll with one that only moves when items are moved to the edge like in a generic scroll view.

## Prior Art

Finder