[whatwg/url] Consider always escaping U+0020 (#125)

In https://github.com/whatwg/url/commit/ad3660f97132738b6b2ff0020656e4cb87365f00 U+0020 changed from being escaped to be not escaped for schemes like data javascript mailto etc. Rationale seems to be that it's what some browsers did back then, per http://krijnhoetmer.nl/irc-logs/whatwg/20121026#l-573

Test http://software.hixie.ch/utilities/js/live-dom-viewer/saved/4238

It appears that Gecko still escapes space in all of these cases. Are there known Web-compat problems for Gecko because of this?

Round-tripping the space can be problematic because space is like the only character that really separates a URL from the next or from the following text. Features like `ping=""` and `srcset=""` will get bogus values if someone assumes that a parse-serialization roundtrip will eliminate spaces from a URL (and it *typically* does).

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