v0.9.1-dev.1

Dev build from the dev branch (heading toward 0.9.1). Not a stable release.

Changes since v0.9.0:

• YouTube: channel video lists now page properly. Fixed a stall where scrolling a channel stopped loading partway (and could knock out playback too), it was re-fetching every video individually and tripping YouTube's rate limit. Channel videos now come through the browse endpoint in one request per page.

Tester build, report anything odd. The in-app updater's Beta channel will offer future dev builds automatically.