[Kernel] Added support for writing/reading GPD files

This breaks settings in games that are using them and savefiles in games that use settings to store progress

src/xenia/kernel/xam/xdbf/gpd_info_title.h

@@ -0,0 +1,60 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2025 Xenia Canary. All rights reserved.                          *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_KERNEL_XAM_XDBF_GPD_INFO_TITLE_H_
+#define XENIA_KERNEL_XAM_XDBF_GPD_INFO_TITLE_H_
+
+#include "xenia/kernel/xam/achievement_manager.h"
+#include "xenia/kernel/xam/xdbf/gpd_info.h"
+#include "xenia/kernel/xam/xdbf/xdbf_io.h"
+
+#include <string>
+#include <vector>
+
+#include "xenia/base/memory.h"
+#include "xenia/base/string_util.h"
+#include "xenia/xbox.h"
+
+namespace xe {
+namespace kernel {
+namespace xam {
+
+class GpdInfoTitle : public GpdInfo {
+ public:
+  GpdInfoTitle() : GpdInfo(-1) {};
+  GpdInfoTitle(const uint32_t title_id) : GpdInfo(title_id) {};
+  GpdInfoTitle(const uint32_t title_id, const std::vector<uint8_t> buffer)
+      : GpdInfo(title_id, buffer) {};
+
+  ~GpdInfoTitle() {};
+
+  std::vector<uint32_t> GetAchievementsIds() const;
+
+  void AddAchievement(const AchievementDetails* header);
+
+  X_XDBF_GPD_ACHIEVEMENT* GetAchievementEntry(const uint32_t id);
+  std::u16string GetAchievementTitle(const uint32_t id);
+  std::u16string GetAchievementDescription(const uint32_t id);
+  std::u16string GetAchievementUnachievedDescription(const uint32_t id);
+
+  uint32_t GetTotalGamerscore();
+  uint32_t GetGamerscore();
+  uint32_t GetAchievementCount();
+  uint32_t GetUnlockedAchievementCount();
+
+ private:
+  const char16_t* GetAchievementTitlePtr(const uint32_t id);
+  const char16_t* GetAchievementDescriptionPtr(const uint32_t id);
+  const char16_t* GetAchievementUnachievedDescriptionPtr(const uint32_t id);
+};
+
+}  // namespace xam
+}  // namespace kernel
+}  // namespace xe
+#endif  // XENIA_KERNEL_XAM_XDBF_GPD_INFO_TITLE_H_