Added initial support for empty PHP class declaration statement to grammar
Added support for PHP 'new' operator to grammar

- Separated out from N_UNARY_OPERATOR so args can be parsed
Fixed support for PHP 'new' operator and added basic support for class declaration statement
Optimisation: moved anchorRegex(...) to parent scope to be reusable
Optimization: re-implemented util.is<type>(...) methods to remove regex for speed