Add "scroll to active" for Dope Sheet

The same way that the Outliner has a "scroll to active" checkbox which allows you to immediately see a selected object in its context, so should the Dope Sheet, so you can see all of the keyframes of the track that you have selected.

Having to enable/disable "only show selected" or pin/unpin bones you want to work on is a massive pain during character animation, and only gets in the way.