Add RemoteCommand 'status' command.

As DMRGateway, it reports connection status.

Command sent: "status" to port: 7642
dstar:n/a dmr:conn ysf:n/a p25:n/a nxdn:n/a fm:n/a

RemoveCommand has been slighlty modified, as using Log on a read-only filesystem simply forbids the strings to be displayed.
Another solution would be to set LogInitialisse's filePath to "/tmp/" for *nix systems.

YSFNetwork.h

@@ -42,6 +42,8 @@ public:
 
 	void reset();
 
+	bool isConnected() const;
+
 	void close();
 
 	void clock(unsigned int ms);