[Suggestion] Show saved character ID on invalid save slots

Currently, if the game tries to load a save for a character that hasn't been loaded yet it simply shows "can't load". Unless you have the character set to load in your autoexec file it's unlikely you'll remember what character that save is meant for. Since the character's ID (e.g. sonic for Sonic) is saved to the save file this could be shown on the save to give some indication as to which character is needed. It may not be perfectly clear for every modded character but it's better than nothing.