Rename support in VS Code and other fixes (dotnet/aspnetcore-tooling#1336)

* Rename support in VS Code and other fixes

* feedback

* more feedback
\n\nCommit migrated from 5e2a8c7924

src/Razor/test/testassets/MvcWithComponents/Test.cs

@@ -0,0 +1,9 @@
+namespace MvcWithComponents
+{
+    public class Test
+    {
+        public static string Foo { get; set; }
+
+        public static string Bar { get; set; }
+    }
+}

src/Razor/test/testassets/MvcWithComponents/Views/Shared/NavMenu.razor

@@ -1,2 +1,4 @@
+@Test.Foo @* Used in a test. Don't remove *@
+
 NavMenu content