TODO: show image of playlist/video TODO: resize window TODO: change menu appearance to something prettier TODO: add a cancel button TODO: add different qualities TODO: set qualities according to format TODO: Validate link (playlist must be public, actual yt link, direct playlist) TODO: Handle errors (unrecognized link, connection error... and print message to user) TODO: see if format link function is neccesary TODO: look into threading TODO: add a progress bar/loading circle