Next version requirments

[ombr]

• Some library need to be started when the application start (SugarORM and gotev upload lib) This is not a cordova plugin best practice and creates a few crash. We would like to remove this startup requirement. We think we should replace the two libraries with native code.
• We need the plugin to gracefully update (SugarORM has an Sqlite database to store the pending uploads) and an update should at best keep the upload at least cancel them (so they can be retried by the app)
• The ci is currently not working, we want a CI setuped and working with a provider (travis or circle ci)
• The plugin should create a fully independent service that can be restarted and will fully manage the upload. (Some android devices restart automatically the service (without the app) when the device is restarted.
• The javascript api must stay unchanged. (If a change is required it need to be discussed)
• IOS version of the plugin should not be touched

We might want to investigate : Android Work Manager:

https://developer.android.com/topic/libraries/architecture/workmanager
https://medium.com/androiddevelopers/introducing-workmanager-2083bcfc4712
gotev/android-upload-service#569