Add a generic variable chooser widget.

The chooser allows choosing variables from a list, and inserting them
into previously focused line edit, text edit, or plain text edit.
Variables are now registered with a description in the variable manager.
Also make the QT_INSTALL_BINS --> CurrentProject:QT_INSTALL_BINS for
consistency.

src/plugins/coreplugin/variablechooser.h

@@ -0,0 +1,76 @@
+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** No Commercial Usage
+**
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+**
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**************************************************************************/
+
+#ifndef VARIABLECHOOSER_H
+#define VARIABLECHOOSER_H
+
+#include "core_global.h"
+
+#include <QtCore/QPointer>
+#include <QtGui/QWidget>
+#include <QtGui/QLineEdit>
+#include <QtGui/QTextEdit>
+#include <QtGui/QPlainTextEdit>
+#include <QtGui/QListWidgetItem>
+
+namespace Core {
+
+namespace Ui {
+    class VariableChooser;
+}
+
+class CORE_EXPORT VariableChooser : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit VariableChooser(QWidget *parent = 0);
+    ~VariableChooser();
+
+private slots:
+    void updateDescription(const QString &variable);
+    void updateCurrentEditor(QWidget *widget);
+    void handleItemActivated(QListWidgetItem *item);
+    void insertVariable(const QString &variable);
+
+private:
+    Ui::VariableChooser *ui;
+    QString m_defaultDescription;
+    QPointer<QLineEdit> m_lineEdit;
+    QPointer<QTextEdit> m_textEdit;
+    QPointer<QPlainTextEdit> m_plainTextEdit;
+};
+
+
+} // namespace Core
+#endif // VARIABLECHOOSER_H