Multi Spotify Login

[paulmccarron]

• Allow multiple people to log in to monitor their Spotify listening activity, spotify clients added to a dictionary using username as key
• Extended playlists database to include user ID for each database, primary key is combination of username and playlist ID
• Spotify endpoints read username from request bearer token and use this to get appropriate spotify client deom dictionary
• Database endpoints read username from request bearer token and use this up read/update appropriate databse entities
• Polling service will loop through each spotify client in dictionary and update based on clients user