Python: Move highlighter and indenter class definitions to .cpp

Change-Id: Ib71d520977034ca66bd84c9188ffed5fe74e1ba0
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/python/pythoneditor.cpp

@@ -293,8 +293,8 @@ PythonEditorFactory::PythonEditorFactory()
 
     setDocumentCreator([]() { return new PythonDocument; });
     setEditorWidgetCreator([]() { return new PythonEditorWidget; });
-    setIndenterCreator([](QTextDocument *doc) { return new PythonIndenter(doc); });
-    setSyntaxHighlighterCreator([] { return new PythonHighlighter; });
+    setIndenterCreator(&createPythonIndenter);
+    setSyntaxHighlighterCreator(&createPythonHighlighter);
     setCommentDefinition(CommentDefinition::HashStyle);
     setParenthesesMatchingEnabled(true);
     setCodeFoldingSupported(true);