PythonEditor: Modernize/Streamline

Remove virtual, add override, add = delete, remove QLatin1*,
flatten filesystem hierarchy, remove unneeded 'inline',
use initializer list, etc.

Change-Id: I0a95d806d73ca1a33cfd1ba85c2664d9ebc32690
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/pythoneditor/pythoneditor.h

@@ -32,8 +32,6 @@ namespace Internal {
 
 class PythonEditorFactory : public TextEditor::TextEditorFactory
 {
-    Q_OBJECT
-
 public:
     PythonEditorFactory();
 };