Put back video metadata
I updated the `video-metadata-rs` crate: now, no more ffmpeg, just pure rust. The webm format isn't checked yet.
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Account for percentages in fixed table layout
Don't just use the minimum length all the time.
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Response API
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This PR adds the [dom::Response](https://fetch.spec.whatwg.org/#response-class) implementation and addresses #11896.
The relevant passing tests` expectations have been updated.
In order to allow non-UTF-8-encoded status messages, `net_traits::response::Response`'s `raw_status` field has been changed from type [`Option<RawStatus>`](https://doc.servo.org/hyper/http/struct.RawStatus.html) to type `Option<(u16, Vec<u8>)>`. As a result, a few other files which rely on the `raw_status` field were affected and updated.
TODOs:
- The `body` and `trailer` methods. Relies on implementation of `ReadableStream` and `Promise`s.
- Similarly, replace the dummy constructor `_body: Option<USVString>` argument with `body: ResponseBodyInit`.
- Currently, whenever `r's response's header list` or `r's Headers object` are mentioned, I always modify the `headers_reflector` field (of type dom::Headers, or `r's Headers object`) and not the corresponding hyper::Headers list in the net_traits::Response field. A completely accurate interpretation of the spec might consider making both of these lists the same thing via a reference. [Discussion](https://github.com/whatwg/fetch/issues/358) was [had](https://github.com/servo/servo/pull/12884).
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Move collapse through margin to the top of block flow
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Based on the spec, a collapse through box should be put on the top edge of the flow. This fixed ~110 reftests
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Update cssparser
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Update webdriver-rust library to 0.14
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This updates the _webdriver-rust_ library to 0.14 and makes the necessary API changes to make it compile with Servo.
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WebBluetooth Android support
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Add android support for Webbluetooth.
Also adjust to the changed device api.
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make nodeList iterable
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Not sure what to test in the script.
Need some advice. o_O
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stylo: support background-size and corner gradients
Forgot to fix this in the midst of all other things fixed in #12945
<s>(not yet tested, need to figure out how to test bg-size with gradients)</s>
r? @bholley
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