PHPCSStandards / PHPCSUtils / 151

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Pull #40

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Utils\Variables: add new reserved name related utility methods

Add a new property related to PHP reserved variables names:
* `$phpReservedVars`

Also adds three new utility methods using this property, for convenience:
* `isPHPReservedVarName()` - to check if a given variable name is the name of a PHP reserved variable. Returns true/false.
* `isSuperglobal()` - to check if a given variable or string array key token points to a PHP superglobal. Returns true/false.
* `isSuperglobalName()` - to check if a given variable name is the name of a PHP superglobal variable. Returns true/false.

When passing a `T_CONSTANT_ENCAPSED_STRING` array index token to the `Name` functions, the string quotes around the name should be stripped in advance.

**Note**: I have not currently added a `isPHPReservedVar()` method as a number of the reserved vars are created within a particular scope depending on the use of a function which creates them and that would need to be checked thoroughly if such a function would be implemented.

Includes dedicated unit tests for the new methods.

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