citra-qt: Move graphics debugging code into its own folder

Keeps all graphics debugging stuff from cluttering up the root debugger
folder

src/citra_qt/debugger/graphics.h

@@ -1,41 +0,0 @@
-// Copyright 2014 Citra Emulator Project
-// Licensed under GPLv2 or any later version
-// Refer to the license.txt file included.
-
-#pragma once
-
-#include <QAbstractListModel>
-#include <QDockWidget>
-#include "video_core/gpu_debugger.h"
-
-class GPUCommandStreamItemModel : public QAbstractListModel,
-                                  public GraphicsDebugger::DebuggerObserver {
-    Q_OBJECT
-
-public:
-    explicit GPUCommandStreamItemModel(QObject* parent);
-
-    int rowCount(const QModelIndex& parent = QModelIndex()) const override;
-    QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
-
-public:
-    void GXCommandProcessed(int total_command_count) override;
-
-public slots:
-    void OnGXCommandFinishedInternal(int total_command_count);
-
-signals:
-    void GXCommandFinished(int total_command_count);
-
-private:
-    int command_count;
-};
-
-class GPUCommandStreamWidget : public QDockWidget {
-    Q_OBJECT
-
-public:
-    GPUCommandStreamWidget(QWidget* parent = nullptr);
-
-private:
-};