* Update picker-panel.css

fix "last item been overlapped by footbar bug" when sidebar items are two more。even overflow can not resolve this problem, it is not the same thing. the details you can see https://dulinrain.github.io/elementui/ElementUI%E4%B9%8B%E6%97%B6%E9%97%B4%E6%8F%92%E4%BB%B6Bug.html

* Update date-picker.css

reply to the reviewe of #7567 (https://github.com/ElemeFE/element/pull/7567)

* Update picker-panel.css

remove the previous fix after the review of  #7567(https://github.com/ElemeFE/element/pull/7567)

* Update date-picker.css

* Update picker-panel.css

* Table: Add `important` rule to `col-resize` cursor

* Table: Add `important` rule to `col-resize` cursor

* Update table-header.js

* [Switch]: Add `allowFocus` prop + blur/focus events

+ Add new `allowFocus` prop
+ Add event emitters for focus & blur events
+ Set `input` $ref `.focus()` on switch click event

* [Switch]: Add styling for when `allowFocus: true`

+ Add styling for when `allowFocus` prop is set to true.
+ Add styling for when input is focused

* [Switch]: Update docs

修复 autocomplete 组件 IE11 下使用搜狗输入法，无法输入中文的问题

* Table: Add `important` rule to `col-resize` cursor

* Table: Add `important` rule to `col-resize` cursor

* Update table-header.js