migrated the codebase to Qt6 and fixed some compatibility issues

* used a Qt6 ported version of SortFilterProxyModel
* used an updated Qt6 compatible version of QXZing
* added a flag to windows linker to avoid WinMain problem of MSVCRTD
* renamed utils.cpp to utilities.cpp for avoiding confusion with the same file name in SortFilterProxyModel

client/ui/framelesswindow.cpp

@@ -104,7 +104,7 @@ void CFramelessWindow::addIgnoreWidget(QWidget* widget)
 bool CFramelessWindow::nativeEvent(const QByteArray &eventType, void *message, long *result)
 {
     if (QOperatingSystemVersion::current() <= QOperatingSystemVersion::Windows7) {
-        return QMainWindow::nativeEvent(eventType, message, result);
+        return QMainWindow::nativeEvent(eventType, message, reinterpret_cast<qintptr*>(result));
     }
 
     //Workaround for known bug -> check Qt forum : https://forum.qt.io/topic/93141/qtablewidget-itemselectionchanged/13
@@ -252,7 +252,7 @@ bool CFramelessWindow::nativeEvent(const QByteArray &eventType, void *message, l
         return false;
     }
     default:
-        return QMainWindow::nativeEvent(eventType, message, result);
+        return QMainWindow::nativeEvent(eventType, message, reinterpret_cast<qintptr*>(result));
     }
 }
 
@@ -280,7 +280,7 @@ QMargins CFramelessWindow::contentsMargins() const
 }
 void CFramelessWindow::getContentsMargins(int *left, int *top, int *right, int *bottom) const
 {
-    QMainWindow::getContentsMargins(left,top,right,bottom);
+    getContentsMargins(left,top,right,bottom);
     if (!(left&&top&&right&&bottom)) return;
     if (isMaximized())
     {

client/ui/pages_logic/NetworkSettingsLogic.cpp

@@ -1,7 +1,7 @@
 #include "NetworkSettingsLogic.h"
 
 #include "defines.h"
-#include "utils.h"
+#include "utilities.h"
 
 NetworkSettingsLogic::NetworkSettingsLogic(UiLogic *logic, QObject *parent):
     PageLogicBase(logic, parent),
@@ -21,14 +21,14 @@ void NetworkSettingsLogic::onUpdatePage()
 
 void NetworkSettingsLogic::onLineEditDns1EditFinished(const QString &text)
 {
-    if (ipAddressRegex().exactMatch(text)) {
+    if (ipAddressRegex().match(text).hasMatch()) {
         m_settings.setPrimaryDns(text);
     }
 }
 
 void NetworkSettingsLogic::onLineEditDns2EditFinished(const QString &text)
 {
-    if (ipAddressRegex().exactMatch(text)) {
+    if (ipAddressRegex().match(text).hasMatch()) {
         m_settings.setSecondaryDns(text);
     }
 }

client/ui/pages_logic/NetworkSettingsLogic.h

@@ -13,7 +13,7 @@ class NetworkSettingsLogic : public PageLogicBase
 
     AUTO_PROPERTY(QString, lineEditDns1Text)
     AUTO_PROPERTY(QString, lineEditDns2Text)
-    READONLY_PROPERTY(QRegExp, ipAddressRegex)
+    READONLY_PROPERTY(QRegularExpression, ipAddressRegex)
 
 public:
     Q_INVOKABLE void onUpdatePage() override;

client/ui/pages_logic/ShareConnectionLogic.cpp

@@ -6,7 +6,7 @@
 
 #include "QZXing.h"
 #include "QZXingImageProvider.h"
-#include "QZXingFilter.h"
+//#include "QZXingFilter.h"
 
 #include "ShareConnectionLogic.h"
 

client/ui/pages_logic/SitesLogic.cpp

@@ -5,7 +5,7 @@
 
 #include "SitesLogic.h"
 #include "VpnLogic.h"
-#include "utils.h"
+#include "utilities.h"
 #include "vpnconnection.h"
 #include <functional>
 
@@ -56,7 +56,7 @@ void SitesLogic::onPushButtonAddCustomSitesClicked()
         newSite.replace("http://", "");
         newSite.replace("ftp://", "");
 
-        newSite = newSite.split("/", QString::SkipEmptyParts).first();
+        newSite = newSite.split("/", Qt::SkipEmptyParts).first();
     }
 
     const auto &cbProcess = [this, mode](const QString &newSite, const QString &ip) {

client/ui/pages_logic/StartPageLogic.cpp

@@ -2,7 +2,7 @@
 #include "core/errorstrings.h"
 #include "configurators/ssh_configurator.h"
 #include "../uilogic.h"
-#include "utils.h"
+#include "utilities.h"
 
 #include <QFileDialog>
 #include <QStandardPaths>
@@ -200,7 +200,7 @@ bool StartPageLogic::importConnectionFromCode(QString code)
         return importConnection(o);
     }
 
-    o = QJsonDocument::fromBinaryData(ba).object();
+    o = QJsonDocument::fromJson(ba).object();
     if (!o.isEmpty()) {
         return importConnection(o);
     }

client/ui/pages_logic/StartPageLogic.h

@@ -3,6 +3,8 @@
 
 #include "PageLogicBase.h"
 
+#include <QRegExp>
+
 class UiLogic;
 
 class StartPageLogic : public PageLogicBase
@@ -22,7 +24,7 @@ class StartPageLogic : public PageLogicBase
     AUTO_PROPERTY(bool, pushButtonBackFromStartVisible)
     AUTO_PROPERTY(bool, pushButtonConnectVisible)
 
-    READONLY_PROPERTY(QRegExp, ipAddressPortRegex)
+    READONLY_PROPERTY(QRegularExpression, ipAddressPortRegex)
 public:
     Q_INVOKABLE void onUpdatePage() override;
 

client/ui/pages_logic/protocols/OtherProtocolsLogic.cpp

@@ -8,7 +8,7 @@
 #include "core/servercontroller.h"
 #include <functional>
 #include "../../uilogic.h"
-#include "utils.h"
+#include "utilities.h"
 
 #ifdef Q_OS_WINDOWS
 #include <Windows.h>
@@ -147,7 +147,7 @@ void OtherProtocolsLogic::onPushButtonSftpMountDriveClicked()
 //#ifndef Q_OS_WIN
 //    args.replace("reconnect-orellinks", "");
 //#endif
-    p->setArguments(args.split(" ", QString::SkipEmptyParts));
+    p->setArguments(args.split(" ", Qt::SkipEmptyParts));
     p->start();
     p->waitForStarted(50);
     if (p->state() != QProcess::Running) {

client/ui/qml/main.qml

@@ -7,7 +7,7 @@ import PageEnum 1.0
 import PageType 1.0
 import Qt.labs.platform 1.1
 import Qt.labs.folderlistmodel 2.12
-import QtQuick.Dialogs 1.1
+import QtQuick.Dialogs
 import "./"
 import "Controls"
 import "Pages"
@@ -263,10 +263,10 @@ Window  {
 //        y: (root.height - height) / 2
         title: qsTr("Exit")
         text: qsTr("Do you really want to quit?")
-        standardButtons: StandardButton.Yes | StandardButton.No
-        onYes: {
-            Qt.quit()
-        }
+//        standardButtons: StandardButton.Yes | StandardButton.No
+//        onYesClicked: {
+//            Qt.quit()
+//        }
         visible: false
     }
     MessageDialog {

client/ui/uilogic.cpp

@@ -36,7 +36,7 @@
 #include "debug.h"
 #include "defines.h"
 #include "uilogic.h"
-#include "utils.h"
+#include "utilities.h"
 #include "vpnconnection.h"
 #include <functional>
 

client/ui/uilogic.h

@@ -1,7 +1,7 @@
 #ifndef UILOGIC_H
 #define UILOGIC_H
 
-#include <QRegExpValidator>
+#include <QRegularExpressionValidator>
 #include <QQmlEngine>
 #include <functional>
 #include <QKeyEvent>