Add cancellability to file manager load and related refactoring
Fixes#12589.
r? @Manishearth
---
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- [x] These changes fix#12589
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Parse style sheets with a real base URL in geckolib.
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Corresponding Gecko change is [bug 1291207](https://bugzilla.mozilla.org/show_bug.cgi?id=1291207).
r? @bholley
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Add form submission for file type input and related fixings
r? @Manishearth
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Bring back run_with_memory_reporting in serviceworkerglobalscope
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Fix FileAPI's refcount implementation
Revise several intricate parts of FileAPI's internal refcounting-related implementation.
Goal: Get it done right once and for all.
r? @Manishearth
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Fix unused variable warning.
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Add support for background-position in geckolib.
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r? @Manishearth
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Prevent injection vulnerability in image page
This is taking up nox' suggestion from #12542 and creates an img element using Rust code instead of escaping the URL. I will look at the neterror.html URL strings separately, we might do those in a similar way.
To reproduce, visit e.g. the following URL with your vulnerable Servo:
```
https://servo.org/screenshot.png?'onload='document.body.innerHTML=`hacked`'
```
---
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- [x] These changes fix#12542
- [x] These changes do not require tests because this is just fixing up existing behavior and I'm not sure how to test it
r?@jdm
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Add missing libraries for Windows
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r? @metajack
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Add FileReaderSync skeleton
Add a FileReaderSync interface skeleton, no concrete implementation yet.
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Remove dead code from table_cell.rs
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Headers API constructor and methods
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This PR fills out the constructor and the delete, get, has, and set methods for the Headers API. Addresses issue #11897 .
The PR also rewrites the append method to support `hyper::header::Headers`'s HashMap `insert` method, which overwrites entries instead of appending.
As a result of this, for a given header name there is at most one value in the inner "header list"/HashMap. Multiple values for the same name are comma-delimited.
There are still a few TODOs:
- Support `OpenEndedDictionary<ByteString>` as a possible `HeadersInit` value. [OpenEndedDictionary<T> is a future IDL construct.](https://fetch.spec.whatwg.org/#headers-class)
- Support `iterable<ByteString, ByteString>`. Related issue: #12628
- Values are comma-delimited, except for values with the name `set-cookie`, which are newline-delimited. This is because values for `set-cookie` are [allowed to contain](https://tools.ietf.org/html/rfc7230#section-3.2.2) inner commas. This violates the [spec](https://fetch.spec.whatwg.org/#concept-header-value-combined).
- The TODOs from PR #12467 regarding value parsing also still need to be resolved.
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- Reworked the append method to support the inner `hyper::header::Headers`'s HashMap `insert` method, which overwrites entries instead of appending.
- Filled out constructor as well as delete, get, has, and set methods.
- Updated relevant test expectations
