PHPCSStandards / PHPCSUtils / 121

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Pull #31

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Util\ObjectDeclarations: add findExtendedInterfaceNames() method

Interfaces can extend more than one interface (in contrast to classes) and both the PHPCS native, as well as  the `Util\ObjectDeclarations` `findExtendedClassName()` method does not allow for that.
See: http://php.net/manual/en/language.oop5.interfaces.php#example-208

To allow for this from within the existing `findExtendedClassName()` method would change the function signature from `@return string|false` to `@return string|array|false`, thus breaking the API.

So, instead, a new `ObjectDeclarations::findExtendedInterfaceNames()` method has been added and it is now explicitly recommended in the documentation of the `findExtendedClassName()` method to use the new method when examining interface declarations.

Includes dedicated unit tests for the new method.

This commit supersedes upstream PR 2128.

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