Review all sniffs for compatibility with PHPCS >= 4.0

Development on PHPCS 4.x has started a while back.

While there is no timeline known for when it will be ready/released, some (breaking) changes which PHPCS 4.x will contain are already known.

Notable changes as known at the time of writing this:
* The minimum supported PHP version is slated to become PHP 7.2.
* Support for the PEAR installation method will be removed.
* Support for JS and CSS sniffs will be removed.
* Support for the "old-style" ignore annotations, like `@codingStandardsIgnoreLine` will be removed. These were deprecated in PHPCS 3.2.0.
* Support for the "old-style" array properties in rulesets, where array items would be passed via a comma separated value instead of as individual items. This was deprecated in PHPCS 3.3.0.
* Deprecated tokens will be removed, most notably `T_ARRAY_HINT` and `T_RETURN_TYPE` which were both deprecated in PHPCS 3.3.0.

I expect most of this won't have much effect on the sniffs in VIPCS. If/when more changes become known, I will update the above list.

However, a decision is needed about the future of the sniffs which look at JS/CSS code. There is no urgency (yet), but I'm opening this issue now to raise awareness and open the discussion about this.

未指定具体文件或测试。首先，根据列出的 PHPCS 4.x 更改检查所有 VIPCS sniff，然后查看关于移除还是保留 JavaScript 和 CSS sniff 的讨论。完成的标准是记录兼容性调查结果，并就受影响的 sniff 做出决定。

由索引模型根据 Issue 内容生成。