Improve error handling by displaying an error message (#1075)

* wire up error messages

* more errors

* fix crash on render error

* Always show copy and cut

* PR comments

* Fix spelling

src/GraphingImpl/Mocks/Graph.h

@@ -29,6 +29,11 @@ namespace MockGraphingImpl
             return std::nullopt;
         }
 
+        HRESULT GetInitializationError()
+        {
+            return S_OK;
+        }
+
         virtual Graphing::IGraphingOptions& GetOptions()
         {
             return m_graphingOptions;