refactor: Routine(s) hold context

packages/behavior/item/routine.js

@@ -7,16 +7,21 @@ export class Routine {
   }
 
   constructor() {
+    this._context = undefined;
     this.actions = new Actions();
   }
 
+  set context(context) {
+    this._context = context;
+  }
+
   fromJSON(json) {
     this.actions.fromObject(json.actions);
     return this;
   }
 
-  tick(context, elapsed) {
-    this.actions.tick(context, elapsed);
+  tick(elapsed) {
+    this.actions.tick(this._context, elapsed);
   }
 
   toJSON() {

packages/behavior/item/routines.js

@@ -7,9 +7,24 @@ export class Routines {
   }
 
   constructor() {
+    this._context = undefined;
     this.routines = {};
   }
 
+  *[Symbol.iterator]() {
+    for (const index in this.routines) {
+      const routine = this.routines[index];
+      yield routine;
+    }
+  }
+
+  set context(context) {
+    this._context = context;
+    for (const routine of this) {
+      routine.context = context;
+    }
+  }
+
   fromJSON(json) {
     for (const i in json.routines) {
       this.routines[i] = (new Routine()).fromJSON(json.routines[i]);