Each actor has an 'onStep' function, if set

Replaced the global 'onStep' with 'onFrame', otherwise it works the
same.

source/actor.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include "toy_vm.h"
+#include "toy_function.h"
 #include "raylib.h"
 
 //sprites loaded from disk
@@ -13,19 +14,20 @@ typedef struct SpriteData {
 //Actors loaded from scripts
 typedef struct ActorData {
 	SpriteData* sprite;
+	Toy_Function* onStep;
 	Vector2 position;
-	//TODO: animation
-	int health;
+	bool enabled;
 } ActorData;
 
 //object pool system
 void initActorAPI(Toy_VM* vm);
 void freeActorAPI(Toy_VM* vm);
 
-void processActorStep(Toy_VM* vm);
+void processActors(Toy_VM* vm);
 void drawActors(Toy_VM* vm);
 
 void loadSprite(Toy_Bucket** bucketHandle, Toy_Value key, const char* fname, int width, int height);
-ActorData* spawnActorAt(Toy_Bucket** bucketHandle, Toy_Value key, int xpos, int ypos);
+ActorData* spawnActorAt(Toy_Bucket** bucketHandle, Toy_Value key, Toy_Function* onStep, int xpos, int ypos);
 
+//opaque hook
 Toy_Value handleActorAttributes(Toy_VM* vm, Toy_Value compound, Toy_Value attribute);