Add a scripting mode to GPClient (#110)

GPClient/vpn.h

@@ -0,0 +1,24 @@
+#ifndef VPN_H
+#define VPN_H
+#include <QtCore/QObject>
+#include <QtCore/QString>
+
+class IVpn
+{
+public:
+    virtual ~IVpn() = default;
+
+    virtual void connect(const QString &preferredServer, const QList<QString> &servers, const QString &username, const QString &passwd, const QString &extraArgs) = 0;
+    virtual void disconnect() = 0;
+    virtual int status() = 0;
+
+// signals: // SIGNALS
+//     virtual void connected();
+//     virtual void disconnected();
+//     virtual void error(const QString &errorMessage);
+//     virtual void logAvailable(const QString &log);
+};
+
+Q_DECLARE_INTERFACE(IVpn, "IVpn") // define this out of namespace scope
+
+#endif