Include BCL assemblies required for VS 2017 build tools

Several assemblies are required by this msbuild task but are not included in MSBuild 2017.

Adding the assemblies to the package alone is not enough, since binding redirects are also missing in msbuild.exe.config. We make up for this with a custom assembly resolver.

Fixes #589

global.json

@@ -1,5 +1,5 @@
 {
   "sdk": {
-    "version": "5.0.100"
+    "version": "5.0.202"
   }
 }

src/Directory.Build.props

@@ -4,7 +4,7 @@
     <BaseIntermediateOutputPath>$(MSBuildThisFileDirectory)..\obj\$(MSBuildProjectName)\</BaseIntermediateOutputPath>
     <OutputPath>$(MSBuildThisFileDirectory)..\bin\$(MSBuildProjectName)\$(Configuration)\</OutputPath>
     <DocumentationRootFolder>$(MSBuildThisFileDirectory)..\wiki\api</DocumentationRootFolder>
-    <LangVersion>8.0</LangVersion>
+    <LangVersion>9.0</LangVersion>
 
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>$(MSBuildThisFileDirectory)strongname.snk</AssemblyOriginatorKeyFile>

src/Nerdbank.GitVersioning.Tasks/AssemblyLoader.cs

@@ -0,0 +1,48 @@
+#if NETFRAMEWORK
+
+using System;
+using System.IO;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+
+namespace System.Runtime.CompilerServices
+{
+    [AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
+    public sealed class ModuleInitializerAttribute : Attribute { }
+}
+
+namespace Nerdbank.GitVersioning.Tasks
+{
+    internal static class AssemblyLoader
+    {
+        [ModuleInitializer]
+        internal static void LoaderInitializer()
+        {
+            AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve;
+        }
+
+        private static Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
+        {
+            try
+            {
+                var required = new AssemblyName(args.Name);
+                string path = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), required.Name + ".dll");
+                if (File.Exists(path))
+                {
+                    AssemblyName actual = AssemblyName.GetAssemblyName(path);
+                    if (actual.Version >= required.Version)
+                    {
+                        return Assembly.LoadFile(path);
+                    }
+                }
+            }
+            catch
+            {
+            }
+
+            return null;
+        }
+    }
+}
+
+#endif

src/Nerdbank.GitVersioning.Tasks/Nerdbank.GitVersioning.nuspec

@@ -27,6 +27,10 @@ IMPORTANT: The 3.x release may produce a different version height than prior maj
     <file src="$BaseOutputPath$net461\Validation.dll" target="build\MSBuildFull\Validation.dll" />
     <file src="$BaseOutputPath$net461\System.Runtime.CompilerServices.Unsafe.dll" target="build\MSBuildFull\System.Runtime.CompilerServices.Unsafe.dll" />
     <file src="$BaseOutputPath$net461\PInvoke.Kernel32.dll" target="build\MSBuildFull\PInvoke.Kernel32.dll" />
+    <file src="$BaseOutputPath$net461\System.Buffers.dll" target="build\MSBuildFull\System.Buffers.dll" />
+    <file src="$BaseOutputPath$net461\System.Memory.dll" target="build\MSBuildFull\System.Memory.dll" />
+    <file src="$BaseOutputPath$net461\System.Runtime.CompilerServices.Unsafe.dll" target="build\MSBuildFull\System.Runtime.CompilerServices.Unsafe.dll" />
+    <file src="$BaseOutputPath$net461\System.Numerics.Vectors.dll" target="build\MSBuildFull\System.Numerics.Vectors.dll" />
     <file src="$LibGit2SharpNativeBinaries$runtimes\**" target="build\runtimes\" />
 
     <!-- Additional copies to work around DllNotFoundException on Mono (https://github.com/dotnet/Nerdbank.GitVersioning/issues/222) -->