Add support for reserved words used as method names

[pkopi]

Prior to PHP 7, reserved keywords can be used as class method names.

When using patchwork for unit tests(using phpunit and symfony) following error occured:

During class fetch: Uncaught ParseError: syntax error, unexpected '\' (T_NS_SEPARATOR), expecting function (T_FUNCTION) or const (T_CONST) in vendor/symfony/dependency-injection/Loader/Configurator/Traits/ClassTrait.php:26

Temporary workaround for this issue is to load ClassTrait before the patchwork library is loaded, but I would appreciate if support for reserved keywords as method names will be added to the library. Thank you!

[jrfnl]

Related to #104

[antecedent]

Thank you for the report, @pkopi! And apologies for the delay. It was quite a surprise to me that token_get_all() has a flag, TOKEN_PARSE, that should solve all of this. It even had it for quite a while already. I will try switching it on.

[jrfnl]

@antecedent Just for your information - TOKEN_PARSE also makes token_get_all() parse error intolerant, which depending on the use-case, can be problematic if code suitable for different PHP versions needs to be tokenized. (I'm not 100% sure where token_get_all() is used here, but just so you know)