Support UHJ (Ambisonics)

https://en.wikipedia.org/wiki/Ambisonic_UHJ_format#Encoding

I must admit that I don't fully understand how Ambisonics works. It will require more detailed study to understand how to decode it.

This summary makes a lot more sense: https://en.wikipedia.org/wiki/Matrix_decoder#Ambisonic_UHJ_kernel_(3:2:4_or_more)