Applying shared_ptr template upcast fix to CSharp, adding CSharp test, and cleanup

Examples/test-suite/csharp/cpp11_shared_ptr_template_upcast_runme.cs

@@ -0,0 +1,15 @@
+// This is the cpp11_shared_ptr_template_upcast runtime testcase. It checks that SWIG generates the appropriate upcasted shared_ptr type for a template instantiation deriving from a base class.
+// For this case, the expected behavior is: given a cptr with underlying type shared_ptr<Printable<Derived> >, PrintableDerived_SWIGSmartPtrUpcast returns a cptr with 
+// underlying type std::shared_ptr< Derived >, where Printable<Derived> inherits from Derived.
+using System;
+using cpp11_shared_ptr_template_upcastNamespace;
+
+public class cpp11_shared_ptr_template_upcast_runme
+{
+    static void Main()
+    {
+        PrintableDerived pd = cpp11_shared_ptr_template_upcast.MakePrintableDerived(20);
+        pd.GetResult();
+        pd.GetFormatted();
+    }
+}