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* feature:
1.add iconfont component;
2.menu can add iconfont icon.

* fix: 调整菜单引入iconfont的方式为String.
1. 新增IconFont组件,需在组件内配置自己的IconFont图标项目地址;
2. 然后,菜单图标可以引入自己的IconFont图标,图标字符串以icon-开头.

* ajust: put the IconFont Script Url into defaultSetting.js

* 调整iconfontUrl名称

* fix:注释更新

* 留空iconfontUrl

* feat: support pwa config

* style: change code style

* feat: add new config "layoutLocal"

* Use enableLayoutLocale instead of layoutLocale

* Use enableMenuLocale instead of enableMenuLocale

* use menu.disableLocal