Add particles!

game/systems/systems.h

@@ -32,6 +32,14 @@ void setAIBehaviour(ecs_entity_t entity, const BzBTNode *root,
  * Animation Systems
  **********************************/
 
+/*
+ * 1: ParticleEmitter
+ */
+void updateParticleEmitter(ecs_iter_t *it);
+
+bool updateParticle(const Texture2D tex, Particle *particle, f32 dt);
+
+Particle spawnParticle(const ParticleEmitter *emitter);
 
 /*
  * 1: Animation