feature: fillswitch strict mode (#1333)

* Add allowed DNS list for killswitch

* Windows killswitch strict mode backend part

* Killswitch strict mode for Linux and MacOS

* Windows fixes

* feature: Add Kill Switch settings page with strict mode option

* fix windows build after merge

* Refresh killswitch mode when it toggled

* Use HLM to store strictMode flag

* Some Linux updates

* feat: Enhance VerticalRadioButton with improved styling and disabled states

* Refresh killSwitch state update

* Fix build

* refactor: Modularize header components

* Change kill switch radio button styling

* Fix strict kill switch mode handling

* Refactor: Replace HeaderType with new Types for headers in QML pages

* Remove deprecated HeaderType QML component

* Refresh strict mode killswitch after global toggle change

* Implement model, controller and UI for killswitch dns exceptions

* Connect backend part and UI

* Change label text to DNS exceptions

* Remove HeaderType from PageSettingsApiDevices

* Some pretty fixes

* Fix problem with definition sequence of PageSettingsKillSwitchExceptions.pml elements

* Add exclusion method for Windows firewall

* Change ubuntu version in deploy script

* Update ubuntu version in GH actions

* Add confirmation popup for strict killswitch mode

* Add qt standard path for build script

* Add method to killswitch for expanding strickt mode exceptions list and fix allowTrafficTo() for Windows. Also Added cache in KillSwitch class for exceptions

* Add insertion of gateway address to strict killswitch exceptions

* Review fixes

* buildfix and naming

---------

Co-authored-by: aiamnezia <ai@amnezia.org>

service/server/killswitch.h

@@ -0,0 +1,31 @@
+#ifndef KILLSWITCH_H
+#define KILLSWITCH_H
+
+#include <QJsonObject>
+#include <QSharedPointer>
+
+#include "secure_qsettings.h"
+
+class KillSwitch : public QObject
+{
+    Q_OBJECT
+public:
+    static KillSwitch *instance();
+    bool init();
+    bool refresh(bool enabled);
+    bool disableKillSwitch();
+    bool disableAllTraffic();
+    bool enablePeerTraffic(const QJsonObject &configStr);
+    bool enableKillSwitch(const QJsonObject &configStr, int vpnAdapterIndex);
+    bool resetAllowedRange(const QStringList &ranges);
+    bool addAllowedRange(const QStringList &ranges);
+    bool isStrictKillSwitchEnabled();
+
+private:
+    KillSwitch(QObject* parent) {};
+    QStringList m_allowedRanges;
+    QSharedPointer<SecureQSettings> m_appSettigns;
+
+};
+
+#endif // KILLSWITCH_H