Settings>Audio>Output submenu hierarchy improvements

Improve the usability of the Settings=>Audio=>Output menu, so you first see a list of physical devices (Speaker, Wired Headset/AUX, USB DAC, Bluetooth, Chromecast) and then underneath each device you select what audio method you wish to use for it (OpenSL ES, AudioTrack, Hi-Res, etc). The current method of choosing the method first, and then selecting what devices should use it, seems counter-intuitive and trips up some new users.