Avoid using 'signals' and 'emit' from Qt to avoid conflicts with other libs (e.g. TBB)

include/jsonrpcserver.h

@@ -48,7 +48,7 @@ public:
     void listen(unsigned int port);
     void close();
 
-signals:
+Q_SIGNALS:
     JsonRPCResult execute(QString method, QMap<QString, QVariant> params);
 private slots:
     void onNewConnection();

src/jsonrpcserver.cpp

@@ -82,7 +82,7 @@ void JsonRPCServer::processTextMessage(QString message)
     JsonRPCResult result;
     if(!method.isEmpty() && !obj.value("jsonrpc").toString().isEmpty()) {
         // perform the RPC
-        result = emit execute(method, params);
+        result = Q_EMIT execute(method, params);
     } else {
         result = JsonRPCResult::error(-32600, "Invalid Request");
     }