templater: move getdictitem() to hybrid class Since a raw dict will never be returned by evalwrapped(), we don't need to support d.get(key).

templater: add try-except stub to runmember() New wrapped interface will raise ParseError if the underlying object doesn't support dict-like lookup operation.

templater: do dict lookup over a wrapped object Dict/list lookup operations will be moved to a wrapped interface so that a returned element can inherit hybrid-ness automatically. wraphybridvalue() will be inlined.