Download manager

Added ability to download audio

Update to Latest

Updates audio_service and just_audio to latest.
Tested in example, and in my app (currently as beta).

Improve hive usage, fix memory limit

Respect hive limits on size of ids.
Fixed control on number of positions saved.

Changing speed works, bug fixes

Fixed ability to change speeds.
Fixed bug - now, position manager will wait a little bit for audio service task to register send port.

Smoother position state

Fixed bug where position went from current position back to start back to current position when media was playing and started playing in middle of other media.

Towards production

Bug fixes! Started using it in my real-world app, found and fixed a bunch of bugs, added some new things.
Notably, some convenience streams which combine media item and playback state.

Improve position clearing etc

Doesn't clear position on android when user swipes away notification or app.
Clears position when media is complete.

Example works, with saving position

The ability was added that just_audio_service saves what the current position is, and allows user to access that from UI code.
Saving and continuing position now works in example.
This is in beta, and I'll now try using it in my app.

Working example

The example project works, using this new just_audio_service plugin.