build(cmake): detect python binary for specified version
<!-- Please describe your changes on the following line: -->
This PR aims to address #20268, by updating cmake definition to lookup python binary to use. Instead of directly asking `python` binary, this PR uses `${PYTHON_EXECUTABLE}` to lookup desired python binary where applicable.
This PR was locally tested on win32 / mac / arch linux via `mach build --dev`, so far local testing shows no build failure regressions, not sure if this is sufficient test.
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix#20268 (github issue number if applicable).
<!-- Either: -->
- [ ] There are tests for these changes OR
- [x] These changes do not require tests because _it's build script update_
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/20290)
<!-- Reviewable:end -->
There are no additional Gamepad tests that pass because our SpiderMonkey
is two years old and cannot cope with `async` (AFAICT), what a time
to be alive!
style: Fix some dead links in style.md
<!-- Please describe your changes on the following line: -->
Part of https://github.com/servo/servo/issues/20126
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [ ] These changes fix #__ (github issue number if applicable).
<!-- Either: -->
- [x] These changes do not require tests because: documentation
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/20282)
<!-- Reviewable:end -->
style: Fix a typo in Integer struct docs
<!-- Please describe your changes on the following line: -->
Fix a typo in `Integer` struct documentation.
---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [ ] These changes fix #__ (github issue number if applicable).
- [x] These changes do not require tests because: documentation
<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->
<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/20283)
<!-- Reviewable:end -->
style: Allow to share style across elements with similar XBL bindings.
Also move the checks so that the tag name checks (presumably cheaper) come earlier.
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/20223)
<!-- Reviewable:end -->
Unbreak the docs build.
I added this to avoid the problem with doc builds leaving around large build artifacts while also working around #17243, but it appears to break the doc build entirely. This won't end up executing on servo-linux1 or servo-linux2 because of #17243, but I'm looking into the correct solution for that simultaneously.
<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/20273)
<!-- Reviewable:end -->
This allows us to not generate trait bounds for field types anymore,
by excluding bounds for type parameters used only in fields annotated
with `#[animation(error)]`.
The syntax is `#[animation(no_bound(Foo, Bar))]` where `Foo` is a type
parameter for the type on which we derive things. Ideally this should
be an attribute on the type parameter but this isn't stable yet.
