70 NET Standard Dependencies

Added a separate package for .net standard dependencies.

Made the OpenTAP linux package not self-contained. Like on windows it is required to have .NET Framework installed, on linux one must have dotnet core installed. This means we can ship way fewer files and the OpenTAP Linux package is now very similar to the OpenTAP windows package.

Changes in Package xml:

The windows package xml should not have changed, but the linux one is much smaller. Here are the .NET DLL files for each:

Linux	Windows
DotNet.Glob.dll	DotNet.Glob.dll
LibGit2Sharp.dll	LibGit2Sharp.dll
Microsoft.CSharp.dll
Mono.Cecil.dll	Mono.Cecil.dll
Newtonsoft.Json.dll	Newtonsoft.Json.dll
System.Collections.Concurrent.dll
System.Collections.Immutable.dll	System.Collections.Immutable.dll
System.IO.Compression.dll	System.IO.Compression.dll
System.IO.FileSystem.Primitives.dll
System.Linq.dll
System.Reflection.Metadata.dll	System.Reflection.Metadata.dll
System.Runtime.Numerics.dll
System.Security.Cryptography.Algorithms.dll
System.Security.Cryptography.Encoding.dll
System.Security.Cryptography.Primitives.dll
System.Threading.dll
	System.Net.Http.dll
	System.ValueTuple.dll
	netstandard.dll

Includes changes from !358 (merged)

Closes #70 (closed)