Add a parser_serialize function and an optional function `serialize' for parsers. The default implementation just prints the text line, which is suitable for parser_textplain and parser_textpatch; gemtext and gophermap uses their own specific unparse functions. This is intended for an incoming cache refactoring: we'll cache the page serialized in the correct format, not once it has been translated to gemtext. This will allow in the future to provide commands such as ``save page to disk'' or interface with an on-disk cache.

it's not spelled `util.h' because otherwise it'd get included instead of /usr/include/util.h

initialize selector, address and port to "" to prevent a NUL deferencing on emit_line

Now that all the queues are correctly initialised, there's no need for that dance.