Added scanner mask
  %x - total number of discs
Added setting to enables/disable storing the total number of discs
Total number of discs is read from/written to Monkey's Audio
Total number of discs is read from/written to FLAC
Total number of discs is read from/written to MP3, MP2
Total number of discs is read from/written to Ogg Vorbis
Total number of discs is read from/written to WavPack