Add idle animation

game/systems.h

@@ -21,7 +21,13 @@ void entitySpatialRemoved(ecs_iter_t *it);
  * 0: Game (singleton) for object pool
  * 1: Path
  */
-void pathRemoved(ecs_iter_t *it);
+void entityPathRemoved(ecs_iter_t *it);
+
+/* Observer (for updating animation state)
+ * 1: Animation
+ * 2: EntityState
+ */
+void entitySetAnimationState(ecs_iter_t *it);
 
 /*
  * 0: Game (singleton) for entity map
@@ -53,6 +59,13 @@ void entityUpdateKinematic(ecs_iter_t *it);
  */
 void entityFollowPath(ecs_iter_t *it);
 
+/*
+ * 0:
+ * 1: Animation
+ * 2: TextureRegion
+ */
+void entityUpdateAnimation(ecs_iter_t *it);
+
 /*
  * 0:
  */