Removed the use of Spotipy library

Error fixed

Error 400 : From the library Spotipy.
This bug caused a lot of trouble, so I chose to create my own version of the library and manipulate it on my own way.

Next update

There's a bug where downloaded tracks will still be printed in the User Interface
Downloading > {Track}
Downloaded -> {Track}
This bug only show up for Ubuntu users, but it'll be fixed in the next update.

Optimizing the size of Playlists Information.json.

Full Changelog: v1.0.5...v1.0.6.1