Moving on from .Net Standard

[gregsdennis]

From testing, it appears that updating to System.Text.Json v7 will require that I drop support for .Net Core 3.1.

I don't expect this will be a problem for most of my users as .Net Core 3.1 is end-of-life anyway, but I feel it deserves notification and a major version bump in the libraries.

This will come... eventually.

[m-gallesio]

Hello.
I just tried using this library in a .NET 7 project, and it pulled in System.Text.Json 7.0.0 with no apparent issues.
Unless there are specific reasons I don't think a forced upgrade is strictly required.

[gregsdennis]

Some further discussions in #532 revealed that it might be time to move on from .Net Standard. I need feedback from users.

This would probably apply to the entire suite.

[gregsdennis]

I now have a branch with everything working for net6.0.

Might try to multi-target with net8.0 later, but very happy this is working for now.

[gregsdennis]

This .Net 7 Regex stuff would be nice to have.

https://devblogs.microsoft.com/dotnet/regular-expression-improvements-in-dotnet-7/#stringsyntaxattribute-regex