Request internet permission before connect for iOS (#794)

* Attempt to fix API error 1100
* NSURLSession fake call to exec iOS network settings dialog
* use http://captive.apple.com/generate_204 for requesting internet
permission
* moved MobileUtils to IosController
* replaced callbacks with signal-slots in apiController

client/platforms/ios/ios_controller.h

@@ -50,12 +50,19 @@ public:
 
     void getBackendLogs(std::function<void(const QString &)> &&callback);
     void checkStatus();
+
+    bool shareText(const QStringList &filesToSend);
+    QString openFile();
+
+    void requestInetAccess();
 signals:
     void connectionStateChanged(Vpn::ConnectionState state);
     void bytesChanged(quint64 receivedBytes, quint64 sentBytes);
     void importConfigFromOutside(const QString);
     void importBackupFromOutside(const QString);
 
+    void finished();
+
 protected slots:
 
 private: