[FSD] Gradually increase number of read lines from FSD socket

* Avoid overflow by gradually reading more lines
* Also improved sending in the same way

src/blackcore/fsd/fsdclient.h

@@ -314,7 +314,8 @@ namespace BlackCore
             void sendClientIdentification(const QString &fsdChallenge);
             void sendIncrementalAircraftConfig();
 
-            void readDataFromSocket();
+            void readDataFromSocket() { this->readDataFromSocketMaxLines(); }
+            void readDataFromSocketMaxLines(int maxLines = -1);
             QString socketErrorToQString(QAbstractSocket::SocketError error);
             void parseMessage(const QString &lineRaw);