Legacy cleanup, part 2 (#3659)

* Legacy cleanup, part 2

There are still things that can be removed, those will be likely done in part three:
`The Return of the Cleanup` :)

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

* Fix windows build

Somehow there were some unfixed errors from enabled warnings?
I'm unsure if I've pulled repo in unstable state, or those were somehow
missed.

Signed-off-by: nemerle <96597+nemerle@users.noreply.github.com>

Gems/LyShine/Code/Editor/PropertiesContainer.cpp

@@ -544,7 +544,7 @@ AzToolsFramework::ComponentEditor* PropertiesContainer::CreateComponentEditor([[
 {
     AzToolsFramework::ComponentEditor* editor = new AzToolsFramework::ComponentEditor(m_serializeContext, m_propertiesWidget, this);
     connect(editor, &AzToolsFramework::ComponentEditor::OnDisplayComponentEditorMenu, this, &PropertiesContainer::OnDisplayUiComponentEditorMenu);
-    
+
     m_rowLayout->addWidget(editor);
     editor->hide();
 
@@ -788,7 +788,7 @@ void PropertiesContainer::Update()
     }
     else // more than one entity selected
     {
-        displayName = (ToString(selectedEntitiesAmount) + " elements selected").c_str();
+        displayName = QString::number(selectedEntitiesAmount) + " elements selected";
     }
 
     // Update the selected element display name