Qt: Initial hotkey implementation

src/duckstation-qt/hotkeysettingswidget.h

@@ -0,0 +1,39 @@
+#pragma once
+#include "core/types.h"
+#include <QtWidgets/QTabWidget>
+#include <QtCore/QMap>
+#include <array>
+#include <vector>
+
+class QtHostInterface;
+class QGridLayout;
+
+class HotkeySettingsWidget : public QWidget
+{
+  Q_OBJECT
+
+public:
+  HotkeySettingsWidget(QtHostInterface* host_interface, QWidget* parent = nullptr);
+  ~HotkeySettingsWidget();
+
+private:
+  enum : u32
+  {
+    ROWS_PER_COLUMN = 10
+  };
+
+  void createUi();
+  void createButtons();
+
+  QtHostInterface* m_host_interface;
+
+  QTabWidget* m_tab_widget;
+
+  struct Category
+  {
+    QWidget* container;
+    QGridLayout* layout;
+  };
+  QMap<QString, Category> m_categories;
+};
+