additonal skip assemblies for signing

SignList.xml

@@ -22,11 +22,15 @@
 
   <ItemGroup>
     <!-- <Skip Include="System.*.dll" /> -->
-    <Skip Include="System.*.dll" />
+    <Skip Include="System.dll" />
+    <Skip Include="mscorlib.dll" />
+    <Skip Include="netstandard.dll" />
+    <Skip Include="WindowsBase.dll" />
     <Skip Include="Microsoft.*.dll" />
     <Skip Include="NuGet.*.dll" />
     <Skip Include="Mono.*.dll" />
     <Skip Include="MonoPosixHelper.dll" />
     <Skip Include="libMonoPosixHelper.dll" />
+    <Skip Include="RazorLight.dll" />    
   </ItemGroup>  
 </Project>