tagOptions property: ignore.sort

[simoncn]

I will update the User guide to clarify that the approach in the ArtistSort example can be used for other tags as well.

Also, I think it would be worth adding support in ignore.sort for prefixes like L' and D' as these are linguistically equivalent to Le, De, etc. The approach I have in mind is to treat ' specially if it is the last character in the prefix and not require a space after it for a match. There would be no special treatment for any other characters.