media-player: refactor

[legendecas]

Compatible mode:

var MediaPlayer = require('@yoda/multimedia').MediaPlayer
var player = new MediaPlayer()
player.start('/opt/media/awake_01.wav')
player.on('playbackcomplete', () => player.stop())

Exact new API:

var MediaPlayer = require('@yoda/multimedia').MediaPlayer
var player = new MediaPlayer()
player.setDataSource('/opt/media/awake_01.wav')
player.prepare()
player.start() // automatically delayed on to prepared
player.on('playbackcomplete', () => player.stop())

Checklist

• [x] npm test passes
• [x] tests and/or benchmarks are included
• [x] documentation is changed or added

[rokidbot]

Can one of the admins verify this patch?

[yorkie]

BTW, we should tweak all the apps before landing this PR :)

[yorkie]

The following apps need changes, too:

• https://github.com/yodaos-project/yodart/blob/next/apps/cloud-player/app.js#L52
• https://github.com/yodaos-project/yodart/blob/next/apps/alarm/media-manager.js#L58

[legendecas]

The following apps need changes, too:

• https://github.com/yodaos-project/yodart/blob/next/apps/cloud-player/app.js#L52
• https://github.com/yodaos-project/yodart/blob/next/apps/alarm/media-manager.js#L58

We strived to have the API compatible with previous version. So no migration was expected alone with this PR now.