Method: Public constructor for class
Method: Check if user if in the associated post membership groups.
Method: Get Group Membership post metabox instance.
Method: Called when the Post is Added or Edited.
Method: Initialize runtime vars.
Method: Called when the Post is Saved.
Method: Add debug message to array.
Method: Output debug message.
Method: Load the Groups Membership Global settings
Method: Get the managed membership post types.
Method: Get Group Membership excluded user roles.
Method: Get Group Membership access denied message.