PHPCSStandards / PHPCSUtils / 99

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Pull #24

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:sparkles: New Utils\Scopes class

New `PHPCSUtils\Utils\Scopes` class which will hold methods related to the scoping of tokens.
This class is closely related to the `PHPCSUtils\Utils\Conditions` class in that it uses the `$tokens[$stackPtr]['conditions']` index.

This class initially contains the following four utility methods:
* `isOOProperty()` - to check if a `T_VARIABLE` token is a class/trait property. Returns true/false.
* `isOOConstant()` - to check if a `T_CONSTANT` token is a class/interface constant.  Returns true/false.
* `isOOMethod()` - to check if a `T_FUNCTION` token is a class/interface/trait method.  Returns true/false.
* `validDirectScope()` - to check the direct condition of an arbitrary token against a set of valid scope conditions. Returns the integer stackPtr to the direct condition if valid or false otherwise.

These methods were written by me and have been battle-tested in the past year or two in the PHPCompatibility standard.

Includes dedicated unit tests.

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