Qt: Implement GDB server

src/duckstation-qt/gdbconnection.h

@@ -0,0 +1,24 @@
+#pragma once
+#include <QtCore/QThread>
+#include <QtNetwork/QTcpSocket>
+
+class GDBConnection : public QThread
+{
+  Q_OBJECT
+
+public:
+  GDBConnection(QObject *parent, int descriptor);
+
+public Q_SLOTS:
+  void gotDisconnected();
+  void receivedData();
+  void onEmulationPaused(bool paused);
+
+private:
+  void writePacket(std::string_view data);
+
+  int m_descriptor;
+  QTcpSocket m_socket;
+  std::string m_readBuffer;
+  bool m_seen_resume;
+};