Contextmenu improve (#3238)

* add a commen contextmenu component

* optimized translate for menu

* repair contextmenu bug

* optimized share btn show code

* repair showShareBtn bug

* optimized contextmenu

* optimized contextmenu code

* complete dirent-item-menu logic

* optimized contextmenu code

* complete dirent-container-menu logic

* complete tree-node-contextmenu logic

* delete unnecessary code

* optimized contextmenu func

* repair bug

* optimized code style

* optimized code style

* add a dirent-none-view for dir-list-view mode

* optimized dirent-container-menu&dirent-item-menu

* add select-item contextmenu

* repair rebase bug

frontend/src/components/context-menu/helpers.js

@@ -0,0 +1,17 @@
+export function callIfExists(func, ...args) {
+  return (typeof func === 'function') && func(...args);
+}
+
+export function hasOwnProp(obj, prop) {
+  return Object.prototype.hasOwnProperty.call(obj, prop);
+}
+
+export function uniqueId() {
+  return Math.random().toString(36).substring(7);
+}
+
+export const store = {};
+
+export const canUseDOM = Boolean(
+  typeof window !== 'undefined' && window.document && window.document.createElement
+);