Update sniffs handling function calls to allow for trailing commas after parameters

[jrfnl]

As of PHP 7.3, trailing commas are allowed after the last parameter in a function call + in the language constructs isset() and unset().

Unit tests for this should be added to the existing sniffs which examine (and fix) function calls and the sniffs will need to be reviewed to see if they handle this correctly and if not, adjusted.

Ref: https://wiki.php.net/rfc/trailing-comma-function-calls

N.B.: A sister-issue has been opened upstream for the same in upstream sniffs: squizlabs/PHP_CodeSniffer#2030

[jrfnl]

The PHPCSUtils PassedParameters class handles this correctly, but it would still be good to add some tests in various sniffs with function calls with trailing commas.

[jrfnl]

All sniffs have been reviewed and fixed to support modern PHP in as far as my imagination reached.

If any more situations would be discovered which need to be taken into account, a new issue should be opened with code samples etc.

Closing this now as fixed.