added import of configs in .ovpn format

- on the "OpenVPN Settings" page, such a config will be displayed as raw text

client/ui/pages_logic/StartPageLogic.h

@@ -32,6 +32,7 @@ public:
     bool importConnection(const QJsonObject &profile);
     bool importConnectionFromCode(QString code);
     bool importConnectionFromQr(const QByteArray &data);
+    bool importConnectionFromOpenVpnConfig(const QString &config);
 
 public:
     explicit StartPageLogic(UiLogic *uiLogic, QObject *parent = nullptr);