Reverse engineered SPA format

A gift from me to the Mario Kart DS community (i think these are used in
Pokemon too). Might work on ingame particle emitters now that I'm the
only person ever to have tried reading these stupid files.

code/engine/ingameRes.js

@@ -43,6 +43,7 @@ window.IngameRes = function(rom) {
 	var characters = [];
 	var karts = [];
 
+	var test = new spa(r.MainEffect.getFile("RaceEffect.spa"));
 	loadItems();
 	loadTires();