[MLA] Loudness normalization with MQA

[Grimm | Eelco]

> I agree with Kevin that using one Metadata field for something it was not originally intended to do is opening a can of worms.
> The players should do it right.

Alright, agreed.

Tidal is sending the metadata in a seperate stream anyway. But in the dump I received from them, album loudness fields were not included. So they probably will have to add it.

All the best,
Eelco