Further refinements to checking of HTML5 documentsorigin/sideshowbarker/html5-updates

Tested and found to be working as expected.

This causes all validation requests for HTML5 documents to just get
re-posted as-is to https://validator.w3.org/nu/ using an HTTP 307
"Temporary Redirect".＊ —with the exception of any requests that have
`output=soap12` or `output=ucn` parameters.

The reason for making temporary exceptions for those soap12/ucn cases is that
some existing tools such as Dreamweaver apparently have integrated support
for HTML checking that relies on calling https://validator.w3.org/ to do
the validation, and that expects the results in the `output=soap12` format.

Other than those exceptions, this change properly 307-redirects all requests
for checking of HTML5 documents to https://validator.w3.org/nu/ (that
includes file-upload requests as well direct-input requests and URL-input
GET requests, and any `output=json` requests regardless of method).

＊Note: Using a 307 gives the meaning "I'm redirecting this particular
request to https://validator.w3.org/nu/ but that doesn't imply you should
necessarily use https://validator.w3.org/nu/ for any further requests",
which seems like the right meaning for this particular case.

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