Suggestion - Map Join Scripts

[LomourKong]

I think in the next major change to the scripts, we should implement a "join script" that activates when players join the map. This could fix some map bugs, such as Tulip Among Tulip's door problem or script storage issues. Instead of running a script when the checkpoint sign is hit, you could run it as soon as a player joins the map. This would guarantee that certain values are set.