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/coreplugin/variablechooser.cpp

@@ -47,7 +47,7 @@ using namespace Core;
 
 VariableChooser::VariableChooser(QWidget *parent) :
     QWidget(parent),
-    ui(new Ui::VariableChooser),
+    ui(new Internal::Ui::VariableChooser),
     m_lineEdit(0),
     m_textEdit(0),
     m_plainTextEdit(0)