Unmaintained [PCN] Spotify BBCode 1.2.0

Spotify has updated their API once again. This small addon update implements the changes made.

Due to possible URL's users may have for a song, I have included 4 possible ways to link to a Spotify song:

https://embed.spotify.com/?uri={$id}
Spotify
https://open.spotify.com/track/{$id}
spotify:track:{$id}

Spotify's API has updated. Therefore, I have updated the plugin to include both embed options

Just a few changes.

- Made the Spotify BB Code support the media tag in the message editor.
- Reduced Spotify size in quotes