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The attribute `skeletonProps` in NoticeIcon tab has default value of `{}` so it doesn't necessary have to be required as stated in typings. This PR fixes it be optional.

* add LoadMore for NoticeIcon

* fix some bugs

* add demo in GlobalHeader

* update docs && change some props' name

* fix some bugs

* fix some bugs

* lint markdown files

* lint markdown files

* 修复 NoticeIcon 列表 Avatar align 问题

* fix .md files

* looking for errors in ci

* add scrollToLoad

* add LoadMore for NoticeIcon

* fix some bugs

* add demo in GlobalHeader

* update docs && change some props' name

* fix some bugs

* fix some bugs

* lint markdown files

* lint markdown files

* 修复 NoticeIcon 列表 Avatar align 问题

* fix .md files

* looking for errors in ci

* add scrollToLoad

* fix: onLoadMore()

* update document

* fix markdown files @NoticeIcon

* feat: add count prop for NoticeIconTab component.(ant-design-pro#2216)
prop count is not required.

* feat: unread notice message demo

* SelectLang: languages options don't need to be translated

* fix e2e tests when `PORT` is set in `.env`

* prettier: fix glob by adding single quotes.

* prettier: running prettier after glob fix

* Add name prop for NoticeIconTab in order to support clear-by-type when using i18n.

* Fix typo

You can pass a react element like a custom icon from icon moon instead of an image.