feat(update: icons for widget):

Author: hanxu317317

lib/common/widget_name_to_icon.dart

@@ -155,5 +155,14 @@ class WidgetName2Icon {
     "CupertinoPageScaffold":Icons.pages,
     "CupertinoPicker":Icons.add_alarm,
     "CupertinoPopupSurface":Icons.center_focus_weak,
+    "CupertinoScrollbar": Icons.fullscreen,
+    "CupertinoSlider": Icons.switch_camera,
+    "CupertinoSegmentedControl": Icons.radio_button_checked,
+    "CupertinoSliverNavigationBar": Icons.subtitles,
+    "CupertinoSwitch": Icons.check_box,
+    "CupertinoTabBar": Icons.tab,
+    "CupertinoTabScaffold": Icons.tab,
+    "CupertinoTabView": Icons.table_chart,
+    "CupertinoTimerPicker": Icons.timer
   };
 }

lib/widgets/themes/Cupertino/CupertinoScrollbar/index.dart

@@ -1,6 +1,5 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_go/common/widget_demo.dart';
-import 'package:flutter_go/widgets/themes/Material/MaterialColor/demo.dart';
 import 'demo.dart';
 const Text0 = '''
 ### **简介**