There are times when an individual change form will want to specify some custom

JavaScript or CSS to be attached to the page. We already had a similar facility

for configforms-based forms. This change makes that same feature available to

regular change forms (which are used throughout the admin UI, and in places

like integration configuration).

Used this in conjunction with the new Review Bot integration. Saw that my

custom JS/CSS was loaded. Verified that other random change forms still worked.