SrtReceiverSource for broadcasted stream

Implemented dedicated source, with UI for creation and saving appropriate settings.
Also updated info and imgui visitors accordingly

SrtReceiverSource.h

@@ -0,0 +1,32 @@
+#ifndef SRTRECEIVERSOURCE_H
+#define SRTRECEIVERSOURCE_H
+
+#include "StreamSource.h"
+
+class SrtReceiverSource : public StreamSource
+{
+    std::string ip_;
+    std::string port_;
+
+public:
+    SrtReceiverSource(uint64_t id = 0);
+
+    // Source interface
+    void accept (Visitor& v) override;
+
+    // StreamSource interface
+    Stream *stream() const override { return stream_; }
+
+    // specific interface
+    void setConnection(const std::string &ip, const std::string &port);
+    std::string ip()   const { return ip_; }
+    std::string port() const { return port_; }
+    std::string uri()  const;
+
+    glm::ivec2 icon()  const override;
+    std::string info() const override;
+
+};
+
+
+#endif // SRTRECEIVERSOURCE_H