This updates the core librar yto .net standard 2.0 and the tests to .net framework 4.8.
There are 7 tests failing but I don't believe that they are the result of the upgrade.
The current library is getting VERY out of date and this will work with 4.6+ of the legacy framework, all of .NET Core 3.x and .NET 5 and 6 without build warnings and errors.
This updates the core librar yto .net standard 2.0 and the tests to .net framework 4.8.
There are 7 tests failing but I don't believe that they are the result of the upgrade.
The current library is getting VERY out of date and this will work with 4.6+ of the legacy framework, all of .NET Core 3.x and .NET 5 and 6 without build warnings and errors.