Revamp Local Fortune Client Example: Fix include order

Fix include order to respect the Coding Conventions.

Include individual headers instead of "generic" headers.

Remove QT_{BEGIN,END}_NAMESPACE because these are private Qt macros that
should not be used in the examples.

Task-number: QTBUG-117036
Pick-to: 6.6 6.5
Change-Id: I33f9c54098824bfcfacac7c2f624554e105a291a
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>

examples/corelib/ipc/localfortuneclient/client.cpp

@@ -1,11 +1,14 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
-#include <QtWidgets>
-#include <QtNetwork>
-
 #include "client.h"
 
+#include <QDialogButtonBox>
+#include <QGridLayout>
+#include <QGuiApplication>
+#include <QMessageBox>
+#include <QTimer>
+
 Client::Client(QWidget *parent)
     : QDialog(parent),
       hostLineEdit(new QLineEdit("fortune")),

examples/corelib/ipc/localfortuneclient/client.h

@@ -4,15 +4,12 @@
 #ifndef CLIENT_H
 #define CLIENT_H
 
-#include <QDialog>
 #include <QDataStream>
+#include <QDialog>
+#include <QLabel>
+#include <QLineEdit>
 #include <QLocalSocket>
-
+#include <QPushButton>
-QT_BEGIN_NAMESPACE
-class QLabel;
-class QLineEdit;
-class QPushButton;
-QT_END_NAMESPACE
 
 class Client : public QDialog
 {

examples/corelib/ipc/localfortuneclient/main.cpp

@@ -1,10 +1,10 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
-#include <QApplication>
-
 #include "client.h"
 
+#include <QApplication>
+
 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);