Reorderable Audio Mixer 1.1.0

First release with vertical layout.

- Hiding a source within the mixer (three dots -> hide) removes it's position intentionally. Unhiding all sources moves all previously hidden sources to the bottom. removing pollution of familiar layout

- hiding a source via inactive in the sources menu does preserve it's position. this gets a bit messy when reordering source from below to over top or over top to below of inactive sources obviously. it works, it's just hard to take inactive scenes into account mentally when moving things.

- Positions persist after OBS restart
- moved buttons from off the items to the bottom of the dock, like standard docks
- muted item's meters will appear grey out when OBS starts, as they should