Improve stream labels + add label source setting + fix VolumeDownKey crash#4

renetinchen1992-hash wants to merge 10 commits intoStreamController:mainStreamController/VolumeMixer:mainfrom

renetinchen1992-hash:feature/better-stream-labelsrenetinchen1992-hash/VolumeMixer:feature/better-stream-labelsCopy head branch name to clipboard