Replace WordPress.PHP.StrictComparisons with Universal.Operators.StrictComparisons

[rebeccahum]

In WordPress/WordPress-Coding-Standards#1919, the WordPress.PHP.StrictComparisons sniff was replaced with Universal.Operators.StrictComparisons.

We currently reference it here:

VIP-Coding-Standards/WordPress-VIP-Go/ruleset.xml

Lines 216 to 218 in 60ad148

	<rule ref="WordPress.PHP.StrictComparisons.LooseComparison">
	<severity>3</severity>
	</rule>

[jrfnl]

Please be aware, this change should not be made until WPCS 3.0.0 has been released or - alternatively - PHPCSExtra has become a direct dependency as otherwise the ruleset will break.

[georgestephanis]

Another item that'll need to be addressed with the 3.0+ migration is that the strip_quotes method is no longer included in \WordPressCS\WordPress\Sniff since WordPress/WordPress-Coding-Standards#1926 -- which seems to be used in at least five files --

https://github.com/Automattic/VIP-Coding-Standards/search?q=strip_quotes

[jrfnl]

@georgestephanis The intention is for VIPCS to start using PHPCSUtils, same as WPCS. A similar strip_quotes() function is available via PHPCSUtils + lots more handy utilities.

As WPCS 3.0.0 will be a major release with breaking changes, in addition to the changelog, an end-user upgrade guide + a dev upgrade guide will be made available.