[perl #53018] grammar not behaving as class

Hi,

I've now made grammars a whole lot more class like. They get
proto-objects and inheritance works too, plus the regexen go in the
correct namespaces. There is some work to do getting Foo::bar to work
now (where Foo is a grammar name and bar is a regex name in the
grammar), but that's a separate issue that hits classes and grammars
just as equally.

So I think the issues this ticket wanted to have addressed have been
sorted out now. :-)

Thanks!

Jonathan