System: Add a libcrypt game list, and check serials

Nag the user if they're missing a sbi file.

src/core/libcrypt_game_codes.h

@@ -0,0 +1,6 @@
+#pragma once
+#include <string_view>
+
+namespace LibcryptGameList {
+bool IsLibcryptGameCode(const std::string_view& serial);
+}