Add bundle

src/play_clj/core_utils.clj

@@ -7,6 +7,16 @@
   [& body]
   `(app! :post-runnable (fn [] ~@body)))
 
+(defn bundle
+  "Returns an entity containing other entities. This is a useful way to keep
+related entities together. They will be drawn in the order they appear in the
+internal :entities vector.
+
+    (bundle (shape :filled) (texture \"image.png\"))
+    (assoc (bundle) :entities [])"
+  [& entities]
+  (BundleEntity. entities))
+
 (defn screenshot!
   "Captures a screenshot and either returns it as a `pixmap` or saves it to the
 specified path.