Multiple changes

[jogibear9988]

• switch to new csproj file format.
• create a version for net472 and net8
• automaticly load correct openssl dll
• switch to ne solution file format (slnx)

[jogibear9988]

Maybe the switch to slnx is a little bit early and should not be done yet, I need to look if building with dotnet command is already possible atm.
I'm also looking to generate a build pipline wich would automaticly create a nuget package. Would this be okay, or do you not want this?

[jogibear9988]

I also added your fix in zlib to cinderblocks/zlib.net#5
So the nuget here: https://www.nuget.org/packages/zlib.net-mutliplatform/1.0.7 could be used (when it is merged)

[thomas-v2]

I can't use .Net Core, and I have to stay at Visual Studio 2019 for some reason.

[thomas-v2]

I had to fix a bug in zlib.net, which is also still present in the .Net core version (maybe no one used zlib with dictionaries, or .Net core handles type casts in a different manner). So I'd like to keep it internally, also I prefer to reduce external dependencies to an absolute minimum. Download the source, and you should be ready to go.

[jogibear9988]

I've seen the bug, I've created a pull with your fix at a zlib nuget package. wich merged it : cinderblocks/zlib.net#5

But no problem to keep it internal.

[jogibear9988]

VS2019 should be possible ( I think, need to try), but for sure the SLNX will not work

[jogibear9988]

@thomas-v2 my changes compile now also in VS2019