Introduce functionality of media types and quality

[RyanSamman]

• Read documentation on QT, how drop-down menus work
• Read documentation on pytube, to parse the streams to access the needed information

[cherylli]

played aroudn with the stream object, this may be useful https://github.com/python-20/video-downloader/projects/2?add_cards_query=is%3Aopen