refactor widget as class. patch engine, frame, cli

src/kiri-mode/cam/animate.js

@@ -2,7 +2,7 @@
 
 "use strict";
 
-kiri.load(function() {
+self.kiri.load(function() {
 
     let KIRI = self.kiri,
         CAM = KIRI.driver.CAM,

src/kiri-mode/fdm/slice.js

@@ -4,7 +4,7 @@
 
 (function() {
 
-    const { base, kiri } = self;
+    const { base, kiri, noop } = self;
     const { driver, fill, fill_fixed, newSlice, utils } = kiri;
     const { config, polygons, util, newPoint } = base;
     const { fillArea } = polygons;