refactor(many files): 页面部分的文件结构调整

1.views 文件夹里面分类，页面相关文件;2.公共组件全部放在components里;3.创建resources文件夹放置资源dart文件4.修改二级菜单文字大小

BREAKING CHANGE: 重构，建议删除本地db,再编译

lib/utils/net_utils.dart

@@ -0,0 +1,17 @@
+import 'package:dio/dio.dart';
+import 'dart:async';
+
+var dio = new Dio();
+
+class NetUtils {
+  
+  static Future get(String url,{Map<String,dynamic> params}) async{
+     var response = await dio.get(url, data: params);
+    return  response.data;
+  }
+
+  static Future post(String url,Map<String,dynamic> params) async{
+    var response = await dio.post(url, data: params);
+    return response.data;
+  }
+}