Impact of IDFA change in iOS 14 on userlevel data collection

An important fix about IDFA has been released in the 1.7.0 version of the iOS Tracker.

The version 1.7.0 fixes an issue causing app rejection due to the fingerprinting caused by the OpenIDFA feature.
To avoid any further issue we have completely removed the OpenIDFA identifier and related code.

Also, we changed the policy for enabling the Apple IDFA. On the new version 1.7.0, the IDFA identifier will be enabled only if the developer adds the AdSupport library to the app project and enables the compiler flag SNOWPLOW_IDFA_ENABLED in the build settings.

More details in the release post of the version 1.7.0