PHPCSStandards / PHPCSUtils / 139

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Pull #37

travis-ci-com

Util\FunctionDeclarations: add new reserved name related utility methods

Add three new properties related to PHP reserved function names:
* `$magicFunctions`
* `$magicMethods`
* `$methodsDoubleUnderscore`

Also adds eight new utility methods using these properties, for convenience:
* `isMagicFunction()` - to check if the function declared on a `T_FUNCTION` token is a PHP magic function. Returns true/false.
* `isMagicFunctionName()` - to check if a given function name is the name of a PHP magic function. Returns true/false.
* `isMagicMethod()` - to check if the function declared on a `T_FUNCTION` token is a PHP magic method. Returns true/false.
* `isMagicMethodName()` - to check if a given function name is the name of a PHP magic method. Returns true/false.
* `isPHPDoubleUnderscoreMethod()` - to check if the function declared on a `T_FUNCTION` token is a PHP native double underscore method. Returns true/false.
* `isPHPDoubleUnderscoreMethodName()` - to check if a given function name is the name of a PHP native double underscore method. Returns true/false.
* `isSpecialMethod()` - to check if the function declared on a `T_FUNCTION` token is a PHP magic method or a PHP native double underscore method. Returns true/false.
* `isSpecialMethodName()` - to check if a given function name is the name of a PHP magic method or PHP native double underscore method. Returns true/false.

The `Name` methods only check a given name, the non-`Name` method also check if the function is a method or global function.

Includes dedicated unit tests for the new methods.

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