Method: Create default LifterLMS Product & Access Plan Visibility Options

Method: Queue all required db updates into the bg update queue

Method: Dispatches the bg updater

Method: Retrieve the default difficulty terms that should be created on a fresh install

Method: Get a string of table data that can be passed to dbDelta() to install LLMS tables

Method: Initializes the bg updater class

Method: Core install function

Method: Remove the difficulties created by the `create_difficulties()` function

Method: Handle form submission of update related actions