Refactoring/ios (#300)

iOS app refactoring (native part):
- connection bugs fixed
- improved stability 
- logs from network extension

client/platforms/ios/ios_controller.h

@@ -0,0 +1,84 @@
+#ifndef IOS_CONTROLLER_H
+#define IOS_CONTROLLER_H
+
+#include "protocols/vpnprotocol.h"
+
+#ifdef __OBJC__
+#import <Foundation/Foundation.h>
+@class NETunnelProviderManager;
+#endif
+
+using namespace amnezia;
+
+struct Action {
+    static const char* start;
+    static const char* restart;
+    static const char* stop;
+    static const char* getTunnelId;
+    static const char* getStatus;
+};
+
+struct MessageKey {
+    static const char* action;
+    static const char* tunnelId;
+    static const char* config;
+    static const char* errorCode;
+    static const char* host;
+    static const char* port;
+    static const char* isOnDemand;
+};
+
+class IosController : public QObject
+{
+    Q_OBJECT
+
+public:
+    static IosController* Instance();
+
+    virtual ~IosController() override = default;
+
+    bool initialize();
+    bool connectVpn(amnezia::Proto proto, const QJsonObject& configuration);
+    void disconnectVpn();
+
+    void vpnStatusDidChange(void *pNotification);
+    void vpnConfigurationDidChange(void *pNotification);
+
+    void getBackendLogs(std::function<void (const QString &)> &&callback);
+    void checkStatus();
+signals:
+    void connectionStateChanged(VpnProtocol::VpnConnectionState state);
+    void bytesChanged(quint64 receivedBytes, quint64 sentBytes);
+
+protected slots:
+
+
+private:
+    explicit IosController();
+
+    bool setupOpenVPN();
+    bool setupCloak();
+    bool setupWireGuard();
+
+    bool startOpenVPN(const QString &config);
+    bool startWireGuard(const QString &jsonConfig);
+
+    void startTunnel();
+
+private:
+    void *m_iosControllerWrapper{};
+#ifdef __OBJC__
+    NETunnelProviderManager *m_currentTunnel{};
+    NSString *m_serverAddress{};
+    bool isOurManager(NETunnelProviderManager* manager);
+    void sendVpnExtensionMessage(NSDictionary* message, std::function<void(NSDictionary*)> callback);
+#endif
+
+    amnezia::Proto m_proto;
+    QJsonObject m_rawConfig;
+    QString m_tunnelId;
+    uint64_t m_txBytes;
+    uint64_t m_rxBytes;
+};
+
+#endif // IOS_CONTROLLER_H