TargetSetupPage: Generalize the page

Generalize the target setup page and move it into projectexplorer

Move the qmake specific code into a projectimporter class with
a specialization for qmake projects in the qt4projectmanager.

This change depends heavily on the BuildConfigurationFactory cleanups
done earlier and completes that change in such a way that generic
build configuration factories are now in theory possible. The
remaining problem is how to select the best factory of several that
claim to be able to handle a kit and that is left for the next patch.

Change-Id: I47134cb1938c52adebcdc1ddfe8dbf26abbbbeee
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/projectexplorer/importwidget.h

@@ -0,0 +1,66 @@
+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** 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, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifndef IMPORTWIDGET_H
+#define IMPORTWIDGET_H
+
+#include <QWidget>
+
+namespace Utils {
+class PathChooser;
+class FileName;
+} // namespace Utils
+
+namespace ProjectExplorer {
+namespace Internal {
+
+class ImportWidget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit ImportWidget(QWidget *parent = 0);
+    ~ImportWidget();
+
+    void setCurrentDirectory(const Utils::FileName &dir);
+
+signals:
+    void importFrom(const Utils::FileName &dir);
+
+private slots:
+    void handleImportRequest();
+
+private:
+    Utils::PathChooser *m_pathChooser;
+};
+
+} // namespace Internal
+} // namespace ProjectExplorer
+
+#endif // IMPORTWIDGET_H