Add CiTrace recording support.

This is exposed in the GUI as a new "CiTrace Recording" widget.

Playback is implemented by a standalone 3DS homebrew application (which only runs reliably within Citra currently; on an actual 3DS it will often crash still).

src/citra_qt/debugger/graphics_tracing.h

@@ -0,0 +1,27 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "graphics_breakpoint_observer.h"
+
+class GraphicsTracingWidget : public BreakPointObserverDock {
+    Q_OBJECT
+
+public:
+    GraphicsTracingWidget(std::shared_ptr<Pica::DebugContext> debug_context, QWidget* parent = nullptr);
+
+private slots:
+    void StartRecording();
+    void StopRecording();
+    void AbortRecording();
+
+    void OnBreakPointHit(Pica::DebugContext::Event event, void* data) override;
+    void OnResumed() override;
+
+signals:
+    void SetStartTracingButtonEnabled(bool enable);
+    void SetStopTracingButtonEnabled(bool enable);
+    void SetAbortTracingButtonEnabled(bool enable);
+};