调整升级

1.更改了electron和nsis镜像地址。
2.升级了electron到20.0.3， 修改了新版romote的处理方式。
3.增加了canvas右键菜单功能。
4.Explorer显示纵向滚动条。

render-process/index.tsx

@@ -2,11 +2,10 @@ import * as ReactDOM from "react-dom";
 import SyncRequest from "sync-request";
 import React, { Component } from "react";
 import { Layout, message, Tabs } from "antd";
-import { ipcRenderer, remote } from "electron";
 import * as Utils from "../common/Utils";
 import MainEventType from "../common/MainEventType";
 import Settings from "../main-process/Settings";
-
+import {ipcRenderer} from "electron";
 import "antd/dist/antd.dark.css";
 import "./index.css";
 import RegisterNode from "./RegisterNode";