Migrate to PHPCSStandards/PHP_CodeSniffer

[kevinfodness]

What problem would the enhancement address for VIP?

Per squizlabs/PHP_CodeSniffer#3932, the squizlabs/php_codesniffer package is being abandoned in favor of phpcsstandards/php_codesniffer. The VIP Coding Standards package depends on the squizlabs version and should be migrated to the phpcsstandards version.

Describe the solution you'd like

Replace the squizlabs/php_codesniffer dependency with phpcsstandards/php_codesniffer at version 3.8.0 (or whatever is current at time of implementation).

[kevinfodness]

This will be fixed by #805

[jrfnl]

@kevinfodness Please actually read the announcement and the release notes of the 3.8.0 release:

• For Composer users, nothing changes.
  In contrast to earlier information, the squizlabs/php_codesniffer package now points to the new repository and everything will continue to work as before.

The phpcsstandards/php_codesniffer package name should NOT be used and, if possible, will be removed from Packagist as soon as all other people who didn't read have migrated back to squizlabs/php_codesniffer.

[kevinfodness]

@jrfnl I apologize, I was acting on outdated information. I read the announcement when it came out, but it seems that the announcement was updated to indicate that changes to Composer installations were no longer required, and I (clearly) didn't read the release notes for v3.8.0. I had updated my fork of this repo and was in the process of creating a PR when I noticed that you already had one started. I appreciate how big of an undertaking this is, and simply wanted to help.

[jrfnl]

@kevinfodness I appreciate the intent. The news that the package name could be retained came a few days after the announcement and before the 3.8.0 release. This news was very welcome as it saves a ton in support issues, but, obviously, it also means that I now need to guard against people acting on outdated information.