Removed binary formatter

[lg2de]

This fixes #1779.

The BinaryFormatter is deprecated. So, it will not get part of the planned net8 target.
For all other targets it has been marked as obsolete, which is a breaking change.
After disussion in the linked issue, the support is finally removed completely.

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[github-actions]

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[coveralls]

Pull Request Test Coverage Report for Build 6396364562

• 5 of 5 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 97.3%

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Totals
Change from base Build 6384600328:	0.0%
Covered Lines:	11594
Relevant Lines:	11796

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💛 - Coveralls

[dennisdoomen]

I thought we wanted to completely get rid of it, right @jnyrup

[Corniel]

LGTM

[lg2de]

I thought we wanted to completely get rid of it, right @jnyrup

From BinaryFormatter Obsoletion Strategy:
Applications which target .NET Framework 2.x, .NET Framework 4.x, or .NET Core 3.1 are not affected by this proposal. BinaryFormatter will continue to work as expected in those applications.

So, why removing code for supported targets?