onSystemAppPaused generates an onStopped event.

[bsutton]

This needs to be reviewed in conjunction with #30

In generally onPause/onResume should not generate onStopped onStarted events.

Need to check the Album as well.

[bsutton]

we should suppress onStopped events being generated form
indirect actions like skip that causes a stop as a side effect.
onStop should only be called if it is the 'end state'.