TextEditor: Factory cosmetics

Pimpl, add some convenience setters.

Change-Id: I525c080179fddab6fe2bd2270505fdbf33e56be2
Reviewed-by: David Schulz <david.schulz@digia.com>

src/plugins/cppeditor/cppeditor.cpp

@@ -150,9 +150,6 @@ void CppEditorWidget::finalizeInitialization()
     d->m_cppEditorDocument = qobject_cast<CppEditorDocument *>(textDocument());
 
     setLanguageSettingsId(CppTools::Constants::CPP_SETTINGS_ID);
-    setCodeFoldingSupported(true);
-    setMarksVisible(true);
-    setParenthesesMatchingEnabled(true);
     setRevisionsVisible(true);
 
     // function combo box sorting