upgrade to .NET 8
fix incorrect handling of P/M values in visibility (#11 @dragonemp)
fix incorrect handling of visibility in SM with fractions larger than 1 (#11 @dragonemp)
upgrade to .NET 8
fix incorrect handling of P/M values in visibility (#11 @dragonemp)
fix incorrect handling of visibility in SM with fractions larger than 1 (#11 @dragonemp)