PR: Update Spoticord to v2.2.0

[DaXcess]

• Rewrote the entire bot (again)
• Updated librespot from v0.4.2 to v0.5.0-dev
• Added /lyrics, which provides the user with an auto-updating lyrics embed
• Added /stop, which disconnects the bot from Spotify without leaving the call (will still leave after 5 minutes)
• Changed /playing to automatically update the embed accordingly
• Renamed /leave to /disconnect
• Removed the Database API, replaced with direct connection to a Postgres database

Fixes the following issues:

• Closes #33
• Closes #31
• Closes #29
• Closes #28
• Closes #27
• Closes #26