Added UDP multicast for plugin discovery (#153)

* Added Timer

* Added UDPSocket::GetAddr

* Added MessageHandlers::SendBeacon()

* PoC of starting a timer on PluginEnable

* C++11

* Added Timer to xcode project

* C++11 in cmake

* added Timer to cmake

* use function pointer in Timer

* moved Timer to namespace

+ wait for thread to join when stopping the timer

* Windows: changed uint to unisgned short

* Windows: Added Timer.h/cpp to project

* GetAddr static

* Send xplane and plugin version with BECN

* SendBeacon with params

* fixed file copyrights

* Include functional

to fix Linux compile error

* review fixes

* Send plugin receive port in BECN

* review fixes

xpcPlugin/UDPSocket.cpp

@@ -138,6 +138,18 @@ namespace XPC
 			Log::FormatLine(LOG_INFO, tag, "Send succeeded. (remote: %s)", GetHost(remote).c_str());
 		}
 	}
+    
+    sockaddr UDPSocket::GetAddr(std::string address, unsigned short port)
+    {
+        struct sockaddr_in addr;
+        memset(&addr, 0, sizeof(addr));
+        addr.sin_family = AF_INET;
+        addr.sin_addr.s_addr = inet_addr(address.c_str());
+        addr.sin_port = htons(port);
+
+        sockaddr* sa = reinterpret_cast<sockaddr*>(&addr);
+        return *sa;
+    }
 
 	std::string UDPSocket::GetHost(sockaddr* sa)
 	{