MPD: Data Fields - Variables

MPD 0.20.18

### - e -

- elapsed_time : player_status , PlayerControl
- enable : AudioOutputPlugin
- enabled : AudioOutput
- end : RangeArg
- end_time : DecoderControl , LightSong , Song
- error : DecoderBridge , DecoderControl
- ERROR : MultiSocketMonitor
- error : PlayerControl
- ERROR : PollGroupEPoll , PollGroupPoll , PollGroupWinSelect , SocketMonitor
- error_count : playlist
- error_type : PlayerControl
- event_loop : EventLoopHolder