UI files: Do not polute the global Ui namespace

Make sure all ui-files are in the plugin's internal namespace.

Change-Id: Ifb2c3093441e8feb89e46f52fbb386fc316cfd13
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/texteditor/behaviorsettingswidget.cpp

@@ -52,7 +52,7 @@ namespace TextEditor {
 
 struct BehaviorSettingsWidgetPrivate
 {
-    ::Ui::BehaviorSettingsWidget m_ui;
+    Internal::Ui::BehaviorSettingsWidget m_ui;
     QList<QTextCodec *> m_codecs;
 };