Refresh PHPCS

[GaryJones]

Bump to PHPCS 3.3 + WPCS 1.0 + PHPCompatibilityWP

• PHP_CodeSniffer 3.3 adds some nice features. The downside is, the 3.x branch requires PHP 5.4 - as long that is available for running PHPCS, there's no reason to stick on PHPCS 2.9.x. Note that we were already using the basepath attribute which requires PHPCS 3.2, and no-one had complained of issues with running PHPCS ;-)

• WordPress Coding Standards 1.0.0 has now been released. See https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards/releases/tag/1.0.0

• PHPCompatibilityWP is a wrapper for PHPCompatibility, with some exclusions for back-compat functions added to WP core. See https://github.com/PHPCompatibility/PHPCompatibilityWP

• PHPCS config file should get comments to make it easier for contributors to understand.

• parallel arg can be added to help speed up scans.

• Switch to new format for array values - old format is deprecated as of 3.3 and removed as of PHPCS 4.

• Exclude long condition closing comment since that is no longer part of the WP coding standards Handbook.

[sc0ttkclark]

Closing since we ended up implementing this via a GitHub action in the end https://github.com/pods-framework/pods/blob/main/.github/workflows/phpcs.yml