Update Target Frameworks

[uniblab]

Describe your changes

Improve interoperability by adding, fixing, and testing following net platforms:

• net461
• net462
• net47
• net471
• net472
• net48
• net481
• netstandard2.0
• net6.0
• net7.0
• net8.0
• net9.0

TODO

There is still room for sorting out the differences between NETSTANDARD2_0 and NETSTANDARD2_1, which I hope to tackle next.

How has this been tested?

All tests from the included test project were executed for each configuration, w/o error.

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [x] I have kept the patch limited to only change the parts related to the patch
• [ ] This change requires a documentation update

See also Contributing Guidelines.