4.0 | Remove JS/CSS Sniffs

With JS and CSS tokenizers slated to be removed in 4.0 of PHPCS, we may have to remove our JS/CSS sniffs for compatibility: https://github.com/squizlabs/PHP_CodeSniffer/issues/2448

JS sniffs:

* JS/WindowSniff.php
* JS/DangerouslySetInnerHTMLSniff.php
* JS/HTMLExecutingFunctionsSniff.php
* JS/InnerHTMLSniff.php
* JS/StringConcatSniff.php
* JS/StrippingTagsSniff.php

CSS Sniffs:

* UserExperience/AdminBarRemovalSniff.php

首先查看链接的 PHP_CodeSniffer 兼容性 issue，以及列出的 JS 和 CSS sniff 文件：JS/WindowSniff.php、JS/DangerouslySetInnerHTMLSniff.php、JS/HTMLExecutingFunctionsSniff.php、JS/InnerHTMLSniff.php、JS/StringConcatSniff.php、JS/StrippingTagsSniff.php 和 UserExperience/AdminBarRemovalSniff.php。确认 PHPCS 4.0 是否要求移除它们；完成的标准是受影响的 sniff 按照这一兼容性决定得到一致处理。

由索引模型根据 Issue 内容生成。