Feature request: support for sort titles/artists/albums as fields

[rexendevar]

Basically what the title says. I have a few albums and artists where my sort titles are different from the actual titles. In particular artists with Japanese names need to have the names in Japanese for my scrobbling to work properly. Masayoshi Takanaka, for instance (高中正義) appears dead last in my sorted list, after every other artist, when really I would prefer to have him sorted under M.

Deadbeef version: 1.9.6