2.0.0: Onboarding and Release Notes UI Support

This release of the SDK adds several new classes, mainly in support for Onboarding UI as well as Release Notes, both products that rely on displaying remotely generated UI. There are also some nullability annotations that are added to improve development on Swift projects.

Since 1.2.1 this release adds support for checking of Release Notes are available, and enabling a way to present Release Notes on demand, making it easy to have a button in your UI that a user can press to view release notes.

This release also changes the method name for presenting Release Notes, and to be compliant with semantic versioning, the major version number has been bumped.