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.h

@@ -56,12 +56,14 @@ namespace XPC
 		/// \param len    The number of bytes to send.
 		/// \param remote The destination socket.
 		void SendTo(const unsigned char* buffer, std::size_t len, sockaddr* remote) const;
-
+        
 		/// Gets a string containing the IP address and port contained in the given sockaddr.
 		///
 		/// \param addr The socket address to parse.
 		/// \returns    A string representation of the socket address.
 		static std::string GetHost(sockaddr* addr);
+        
+        static sockaddr GetAddr(std::string address, unsigned short port);
 	private:
 #ifdef _WIN32
 		SOCKET sock;