PHPCSStandards / PHPCSUtils / 178

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Pull #48

travis-ci-com

:sparkles: New Utils\PassedParameters class

This introduces four new methods to PHPCSUtils.

These methods are intended for use with:
* `T_STRING` and `T_VARIABLE` tokens for function calls;
* `T_SELF` and `T_STATIC` token for function calls in the form of `new self()`;
* `T_ARRAY` and `T_OPEN_SHORT_ARRAY` tokens for array declarations;
* `T_ISSET` and `T_UNSET` tokens for calls to these language constructs.

Methods:
* `hasParameters()` - to check if parameters have been passed. Returns true/false.
* `getParameters()` - to retrieve details of the passed parameters. Returns an array with `start` (token position), `end` (token position), `raw` (string content) and `clean` (string content without comments) information for each parameter.
* `getParameter()` - to retrieve the details of a specific parameter. Index for the parameters is 1-based. Returns an array with the details for the specified parameter or `false` if the parameter does not exist.
* `getParameterCount()` - to get the a count of the number of parameters. Returns integer.

These methods have been battle-tested in the past year or two in the PHPCompatibility and the WordPressCS standards.

Includes dedicated unit tests.

N.B.: In the class as pulled to PHPCS originally, these methods also handled (short/long) list constructs, however, as lists can have empty entries - `list(,,)` - prior to PHP 7 and can skip items - `list($a,, $b)` - in cross-version PHP, parsing lists with the functions in this class will break on those type of list definitions.
So, I've decided that this is better served with a dedicated utility function focussing just on list constructs.

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