Add Microsoft.VisualStudio.ProjectSystem.SDK package reference.

Author: allisterb

src/Stratis.VS.StratisEVM/Stratis.VS.StratisEVM.csproj

@@ -94,6 +94,9 @@
     <PackageReference Include="Microsoft.VisualStudio.LanguageServer.Protocol">
       <Version>17.1.68</Version>
     </PackageReference>
+    <PackageReference Include="Microsoft.VisualStudio.ProjectSystem.SDK">
+      <Version>17.9.380</Version>
+    </PackageReference>
     <PackageReference Include="Microsoft.VisualStudio.SDK" Version="17.0.32112.339" ExcludeAssets="runtime" />
     <PackageReference Include="Microsoft.VisualStudio.Workspace">
       <Version>17.1.11-preview-0002</Version>
@@ -147,9 +150,7 @@
       <ManifestResourceName>StratisEVMPackage</ManifestResourceName>
     </EmbeddedResource>
   </ItemGroup>
-  <ItemGroup>
-    <Folder Include="Templates\Projects\SolidityProject\" />
-  </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="$(VSToolsPath)\VSSDK\Microsoft.VsSDK.targets" Condition="'$(VSToolsPath)' != ''" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it.