+ Updated cleanup function to remove the entire temporary lecture folder instead of just leaving behind tons of empty folders
+ Fixed typo in mux function
+ Segment count is now properly calculated from segment timeline
+ Manifest is now parsed from the URL instead of being downloaded, this should be better for downloading multiple courses at once.
+ Fixed a bug where audio content_type would try to find a max quality
+ New Downloader: Threaded Downloader uses multiple threads to download files, this should improve download speeds greatly. By default, the threaded downloader is not used, you can use the threaded downloader by passing ``--use-threaded-downloader``. By default, it only uses 10 threads, you can set a custom number of threads with the ``--threads`` option
