[RFC] Treat namespaced names as single token, relax reserved keyword restrictions

Hi internals, Inspired by the recent discussion on reserved keyword reservation, I'd like to propose the following RFC: https://wiki.php.net/rfc/namespaced_names_as_token This RFC makes two related changes: Treat namespaced names as a single token, which enables use of reserved keywords inside them. And remove reserved keyword restrictions from various declarations. The RFC comes with a small backwards compatibility break related to names that include whitespace, but will hopefully reduce the backwards compatibility impact of future reserved keyword additions. Regards, Nikita