Internal developer test mode support for Android
Staging server test mode support for iOS
Increase hide delay to 250ms for Unity games
Add debug logging to activity lifecycle events
remove faulty code path for analyticsMachineName
Revert "remove faulty code path for analyticsMachineName"

This reverts commit a98e63f28388d7b60eac2f51ec6556a49ed20b2d.
Merge branch 'master' into network-selection

Conflicts:
	ios/UnityAds/UnityAds.h
	ios/UnityAds/UnityAdsProperties/UnityAdsProperties.h