Fix: Handle iOS audio events

[ronaldheft]

This PR addresses several issues (fixes #343):

• The active audio session is now changed to false when the player is paused
  • This also ensures the below fixes do not trigger when the player is paused
• When an audio interruption occurs (such as Siri, directions in CarPlay, a phone call, etc), if ABS was playing before the interruption occurred, ABS will resume playback after the interruption
  • The player will use the skipBack setting when resuming, so for long interruptions, audio will be allowed to rewind back
• If plugging in headphones, audio will continue in the headphones
• If disconnecting headphones, audio will stop playing
  • There may be other scenarios we want to pause audio, but I'm not sure of them at this moment
  • We now have the framework to add others in the future

Note: This PR also includes #359 as there was a merge conflict that needed to be fixed between them. If you would like to review the code for this without #359, I can trigger an update to this PR after #359 is merged

[ronaldheft]

Synced this branch after the merge, so the PR shows only the code changed for this issue.

[advplyr]

I tested connecting/disconnecting headphones and it worked as you described.

I also tested with maps and the pause then seek back worked great.