Rework ModBuildConfig Assembly Handling

[Fayti1703]

This PR:

• Changes the Publicizer to Fayti1703.AssemblyTasks.PublishAllTypes
• Unhacks the dependency on Nanoray.ExtractSingleFileAssemblyResourceTask
• Ensures the game DLL is always present prior to MSBuild trying to load it (at least, according to my SDK build files)
• Disables the Publicizier in Legacy mods

Open issues:

• [x] The pack task currently complains that:

  /sdk/…/NuGet.Build.Tasks.Pack.targets(221,5): warning NU5128: Some target frameworks declared in the dependencies group of the nuspec and the lib/ref folder do not have exact matches in the other location. Consult the list of actions below: [/udata/…/Nickel/ModBuildConfig/ModBuildConfig.csproj]
  /sdk/…/NuGet.Build.Tasks.Pack.targets(221,5): warning NU5128: - Add lib or ref assemblies for the netstandard2.0 target framework [/udata/…/Nickel/ModBuildConfig/ModBuildConfig.csproj]

  I'm pretty sure we can ignore this? This seems to happen because the lib directory doesn't exist, but we have a <group targetFramework=".NETStandard2.0"> in the .nuspec due to the declared dependencies.

[Shockah]

As it is, this PR makes Nickel mods not build in VS. dotnet build works, as do legacy from VS.

[Fayti1703]

I've pushed a new version of Fayti1703.AssemblyTasks that should target netstandard2.0, as VS requires for its builds (for whatever reason). @Shockah, could you check if this fixes the issue on your end?