Amazon ADM support + Fixes

* Added support for Amazon ADM messages.
* Optimized network calls to only call on_focus when 30 seconds of active time is accumulated.
* Fixes very rare crash when pressing "Upgrade" on the 'Google Play services' missing dialog.
* Fixed issue were player id was not getting updated when the player was delete from the GameThrive User's list.

Example
* Added message about failing to register to label.
* Added AndroidManifest-ADM.xml, just use this in place of the normal AndroidManifest.xml to quickly test ADM notifications.
* Turned on proguard to show config change needed to use it.