GameList: Add dedicated gameicons directory

src/core/game_list.h

@@ -130,6 +130,13 @@ void SaveCustomTitleForPath(const std::string& path, const std::string& custom_t
 void SaveCustomRegionForPath(const std::string& path, const std::optional<DiscRegion> custom_region);
 std::string GetCustomTitleForPath(const std::string_view path);
 std::optional<DiscRegion> GetCustomRegionForPath(const std::string_view path);
+
+/// The purpose of this cache is to stop us trying to constantly extract memory card icons, when we know a game
+/// doesn't have any saves yet. It caches the serial:memcard_timestamp pair, and only tries extraction when the
+/// timestamp of the memory card has changed.
+std::string GetGameIconPath(std::string_view serial, std::string_view path);
+void ReloadMemcardTimestampCache();
+
 }; // namespace GameList
 
 namespace Host {