MPRIS support for music playing

MPRIS2 is the protocol used on Linux systems for controlling media players. It could be used to enable media player agnostic Listening to functionality to Discord.

There are already some community projects to support this:

https://github.com/FichteFoll/discordrp-mpris

https://github.com/RayzrDev/discord-rpc-mpris

However, these require to run separate programs. It would be cool if Discord supports this by default.