Sorting fixes (outside of the ABCs)

[grenavitar]

Firstly, this is amazing. Definitely the best remote player I have found and thanks for your hard work on it.

堀江由衣
Øystein Sunde
عمر دياب

These all have in common that they're sorted under #. For a user with a large number of Japanese / Arabic artists it is somewhat annoying. Firstly, Ø, Å and the like should go with their letters. Then Kanji should be sorted in its way and Arabic in its. I think unicode has a method for doing this sorting but it seems that they should be sorted and not just put under # in an order that doesn't make much sense.

[sindre_mehus]

You can configure this yourself in Settings > General > Index.

I have never tested it with non-Latin characters, but it should work in theory. It works for Æ, Ø, Å, at least.