Function: Get all enrolled courses ids

Function: Get all enrolled courses by specific user

Function: Get wishlist courses by specific user

Function: Return Add new course URL

Filter Hook: Filter dozent_add_new_course_url() function return;

Function: Determine if a post (course | lecture) containing video

Filter Hook: Filter default return value by video property

Filter Hook: Filter default return value

Function: Get Lecture Video Streaming URL

Filter Hook: Filter video streaming URL