added killSwitch switcher (#746)

* added killSwitch switcher
* KillSwitch toggle for OpenVPN and XRay
* killSwitch toggle for AWG/WG protocol
* Some fixes for killSwitch

client/daemon/daemon.cpp

@@ -374,6 +374,8 @@ bool Daemon::parseConfig(const QJsonObject& obj, InterfaceConfig& config) {
     return false;
   }
 
+  config.m_killSwitchEnabled = QVariant(obj.value("killSwitchOption").toString()).toBool();
+
   if (!obj.value("Jc").isNull()) {
     config.m_junkPacketCount = obj.value("Jc").toString();
   }

client/daemon/interfaceconfig.h

@@ -37,6 +37,7 @@ class InterfaceConfig {
   QList<IPAddress> m_allowedIPAddressRanges;
   QStringList m_excludedAddresses;
   QStringList m_vpnDisabledApps;
+  bool m_killSwitchEnabled;
 #if defined(MZ_ANDROID) || defined(MZ_IOS)
   QString m_installationId;
 #endif