* Add `mediaSubType` field to device formats * Create FourCharCode `toString` extension * Move pixelFormat -> `AVCaptureDevice.Format+toDictionary` * `mediaSubType` -> `pixelFormat` + non-optional * ts pixelFormat `string` -> specific formats * Add default pixelFormat value of `420v` on Android Co-authored-by: tcoldwell72 <31568400+tcoldwell72@users.noreply.github.com>