some more moving code around

game/Debug.js

@@ -0,0 +1,21 @@
+let _pt = 0
+let _mindiff = 0
+
+const checkpoint_start = (mindiff) => {
+  _pt = performance.now()
+  _mindiff = mindiff
+}
+
+const checkpoint = (label) => {
+  const now = performance.now();
+  const diff = now - _pt
+  if (diff > _mindiff) {
+    console.log(label + ': ' + (diff));
+  }
+  _pt = now;
+}
+
+export default {
+  checkpoint_start,
+  checkpoint,
+}