Add TargetNetStandard switch

[Foxtrek64]

As discussed in the Discord. Adds a new switch, <TargetNetStandard /> which accepts a value of true or false (default true), to allow optionally targeting netstandard2.1.

Use:

<Project Sdk="Remora.Sdk/1.0.0">
    <PropertyGroup>
        <VersionPrefix>1.0.0</VersionPrefix>
        <TargetNetStandard>false</TargetNetStandard>
    </PropertyGroup>

    <PropertyGroup>
        <LegalAuthor>John Doe</LegalAuthor>
        <LegalEmail>john@doe.org</LegalEmail>
    </PropertyGroup>
</Project>

This should also be settable in the solution's Directory.Build.props if one desires to configure this at that level.

[Foxtrek64]

I think I got these fixed.

[Nihlus]

You're missing an asterisk here to mark the property as a Remora extension.

[Nihlus]

Looks like something broke with your latest changes. Can you take a closer look at what's going on?

[Foxtrek64]

Looks like something broke with your latest changes. Can you take a closer look at what's going on?

For some reason on build, the Project.AssemblyInfo.cs files for the test libraries end up with a duplicate [assembly: System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage] line. I'm not sure where this is coming from or why it's being added. The files say they're "Generated by the MSBuild WriteCodeFragment class." Do you know what may be going on here?

[Nihlus]

Afraid not - the SDK does add that attribute in certain cases, and your best bet would be to either use a git bisect or combinations of the involved properties (old and new) to identify the exact failure case.