QmlDesigner: QmlPuppet as standalone tool

The qmlpuppet is now a standalone tool. There is new a library too with
the communication code. That is shared between the designer and the
puppet. It's in a .cmake file so it can be included by the standalone
tool if it is not part of a designer build.

Task-number: QDS-5879
Change-Id: I2bc2a0b463fbb3e0c8c23d182abfd368cf87e968
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/libs/qmlpuppetcommunication/commands/changepreviewimagesizecommand.cpp

@@ -0,0 +1,24 @@
+// Copyright (C) 2020 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0 WITH Qt-GPL-exception-1.0
+#include "changepreviewimagesizecommand.h"
+
+#include <QDebug>
+
+namespace QmlDesigner {
+
+QDataStream &operator<<(QDataStream &out, const ChangePreviewImageSizeCommand &command)
+{
+    return out << command.size;
+}
+
+QDataStream &operator>>(QDataStream &in, ChangePreviewImageSizeCommand &command)
+{
+    return in >> command.size;
+}
+
+QDebug operator<<(QDebug debug, const ChangePreviewImageSizeCommand &command)
+{
+    return debug.nospace() << "ChangePreviewImageSizeCommand(" << command.size << ")";
+}
+
+} // namespace QmlDesigner