Move queue resolution outside of drawing

engine/core.scm

@@ -298,8 +298,12 @@
 	  event)
 	#f)))
 
-(define (frame-loop)
+;; Frame generation interface
+(export make-next-frame)
+;; Generate the next frame, for use in the main game loop
+(define (make-next-frame)
   (resolve-entity-queue)
   (resolve-system-queue)
-  (execute-systems))
+  (with-drawing
+   (execute-systems)))
 )