Add option to retry after successful stream end

[eshaz]

In IcecastMetadataPlayer, a new option should be added that triggers retry logic after a successful disconnect of a stream. This may help listeners reconnect when a disconnect is caused by something other than a network error, such as the Icecast server / source disconnecting and restarting the stream.

I've seen that the majority of Icecast streams are meant to continue indefinitely, such as with a radio station. In these cases, any disconnect should be treated as an error. This option might make sense to default to true because of this usage pattern.

options.alwaysReconnect: default true

• Set to true to reconnect after a stream is disconnected for any reason.
  • Retry logic will take place when the stream ends with or without a fetch request error.
  • The stream will end without an error if the Icecast server initiates the disconnect (i.e when a source ends or the Icecast server is restarted).
• Set to false to stop playback after a stream is disconnected successfully on the server side.
  • Retry logic will take place when the stream ends only with a fetch request error.