[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/xbox.h

@@ -13,6 +13,7 @@
 #include <map>
 #include <string>
 
+#include "xenia/base/chrono.h"
 #include "xenia/base/memory.h"
 #include "xenia/base/string.h"
 
@@ -463,6 +464,48 @@ struct X_KSPINLOCK {
   xe::be<uint32_t> prcb_of_owner;
 };
 static_assert_size(X_KSPINLOCK, 4);
+
+struct X_FILETIME {
+  static constexpr uint64_t minimal_valid_time = 125911584000000000;
+  static constexpr uint64_t maximal_valid_time = 157469184000000000;
+
+  xe::be<uint32_t> high_part;
+  xe::be<uint32_t> low_part;
+
+  X_FILETIME() {
+    high_part = 0;
+    low_part = 0;
+  }
+
+  X_FILETIME(uint64_t filetime) {
+    high_part = static_cast<uint32_t>(filetime >> 32);
+    low_part = static_cast<uint32_t>(filetime);
+  }
+
+  X_FILETIME(std::time_t time) {
+    const auto file_time =
+        chrono::WinSystemClock::to_file_time(chrono::WinSystemClock::from_sys(
+            std::chrono::system_clock::from_time_t(time)));
+
+    high_part = static_cast<uint32_t>(file_time >> 32);
+    low_part = static_cast<uint32_t>(file_time);
+  }
+
+  chrono::WinSystemClock::time_point to_time_point() const {
+    const uint64_t filetime =
+        (static_cast<uint64_t>(high_part) << 32) | low_part;
+
+    return chrono::WinSystemClock::from_file_time(filetime);
+  }
+
+  bool is_valid() const {
+    const uint64_t filetime =
+        (static_cast<uint64_t>(high_part) << 32) | low_part;
+
+    return filetime >= minimal_valid_time && filetime <= maximal_valid_time;
+  }
+};
+static_assert_size(X_FILETIME, 0x8);
 #pragma pack(pop)
 
 // Found by dumping the kSectionStringTable sections of various games:
@@ -487,6 +530,7 @@ enum class XLanguage : uint32_t {
 };
 
 enum class XContentType : uint32_t {
+  kInvalid = 0x00000000,
   kSavedGame = 0x00000001,
   kMarketplaceContent = 0x00000002,
   kPublisher = 0x00000003,