Add support for non-standard track numbers
It's not uncommon for people who rip Vinyl LP's to use a numbering system that resembles the numbering used on those LP's. For example A1, A2, A3, B1, B2, B3 and so on. I remember foobar2000 on Windows supporting this. Kid3 which is an open source metadata tag editor seems to have no issue with reading and writing track numbers in this way. More recently, I came across a digital album with tracks formatted as 1.00, 1.01, 1.02, and so on. Would it be possible to implement support for strange or non-standard track numbers in Strawberry?