Fix lints in nightly CI

[HadrienG2]

Technically, one of the "fixes" is actually a workaround for a clippy false positive. But I actually like the workaround version better.

Along the way, this also fixes a trait bound bug where the "external" PartialEq impl of XML did not work because I expressed it in terms of str, when string comparison traits are actually implemented for &str.

[semanticdiff-com[bot]]

Review changes with SemanticDiff.

Analyzed 2 of 2 files.

Overall, the semantic diff is 49% smaller than the GitHub diff.

	Filename	Status
:heavy_check_mark:	src/lib.rs	77.84% smaller
:heavy_check_mark:	src/topology/export/xml.rs	35.53% smaller

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (9ad1103) 65.28% compared to head (8bfd315) 65.28%.

Files	Patch %	Lines
src/topology/export/xml.rs	0.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #105 +/- ## ======================================= Coverage 65.28% 65.28% ======================================= Files 43 43 Lines 4632 4632 ======================================= Hits 3024 3024 Misses 1608 1608 ``` | [Flag](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/105/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.) | Coverage Δ | | |---|---|---| | [ubuntu-latest](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/105/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.) | `66.53% <0.00%> (ø)` | | | [windows-latest](https://app.codecov.io/gh/HadrienG2/hwlocality/pull/105/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.) | `63.90% <0.00%> (-0.05%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Hadrien+G.#carryforward-flags-in-the-pull-request-comment) to find out more.

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