Linker refactor and v2 refresh

[adrianstevens]

No description provided.

[CartBlanche]

@adrianstevens: apparently your changes make use of "primary constructors" which is currently in preview. Keep in mind that the Windows extension is still net 4.7.2 (I'm looking into seeing if MS have pulled their finger out to allow newer .NET versions in extensions), so even though the CLI might build, the extension might not. I was recently bitten by a similar issue in another PR :/.

I think we need to standardise what .NET versions we should be targetting across the board. Using preview might be cool, but might not be great for stability. Should we say highest we can stable release? Is there another metric we can use?

CC @ctacke for visibility.

[adrianstevens]

Absolutely - no need for the primary ctor, I was just playing with the feature

[adrianstevens]

and fixed