rewriting a good chunk of the parse mode code to better fit the complexity

of the current decision process. While SGML and XML were exclusive, the
addition of HTML5 had made the code ugly and convoluted.

The pre-parsing now results in $File->{Mode} being either:
* "DTD+SGML"
* "DTD+XML"
* "HTML5"
* "HTML5+XML"
... with potential extensibility using the {parser}+{family} syntax


This should also fix a number of bugs found with the HTML5 integration:
http://www.w3.org/Bugs/Public/show_bug.cgi?id=5987
http://lists.w3.org/Archives/Public/www-validator/2008Aug/0059.html

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