[whatwg/xhr] How should getResponseHeader() and getAllResponseHeaders() work (#109)

Value separator: should likely become ", ", not ",".

Header casing: unclear, @youennf suggests lowercase is feasible.

Header sorting: unclear, different order among browsers suggests lexicographical might be feasible (this is what the standard requires at the moment).

Tests: https://github.com/w3c/web-platform-tests/pull/4641.

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