Change: Display more useful information in sprite aligner than sprite ID. (#12439)

Sprite IDs are not useful information given they change don't refer to anything outside the loaded game.

Instead, include the filename and nfo line at minimum, and include action A or action 5 sprite replacement information if applicable.

src/spritecache.cpp

@@ -74,6 +74,15 @@ static SpriteFile *GetCachedSpriteFileByName(const std::string &filename)
 	return nullptr;
 }
 
+/**
+ * Get the list of cached SpriteFiles.
+ * @return Read-only list of cache SpriteFiles.
+ */
+std::span<const std::unique_ptr<SpriteFile>> GetCachedSpriteFiles()
+{
+	return _sprite_files;
+}
+
 /**
  * Open/get the SpriteFile that is cached for use in the sprite cache.
  * @param filename      Name of the file at the disk.