Add format class for Audacity extended label track, fix #213

[NickleDave]

• [x] Add format class for Audacity extended label track, fix #213. As suggested by @shaupert with an initial implementation in #222. This format will have the shorthand string name 'aud-bbox'
• [x] Rename existing format 'aud-txt' -> 'aud-seq' to clarify relationship to 'aud-bbox' (both use txt files)
• [x] Make noxfile lint session match what GitHub Actions lint workflow does
• [x] Other minor clean-ups

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.03 :warning:

Comparison is base (38c7a68) 94.11% compared to head (d1b4572) 94.09%.

:exclamation: Current head d1b4572 differs from pull request most recent head fdd1bf0. Consider uploading reports for the commit fdd1bf0 to get more accurate results

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #226 +/- ## ========================================== - Coverage 94.11% 94.09% -0.03% ========================================== Files 39 41 +2 Lines 1462 1541 +79 ========================================== + Hits 1376 1450 +74 - Misses 86 91 +5 ``` | [Impacted Files](https://codecov.io/gh/vocalpy/crowsetta/pull/226?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [noxfile.py](https://codecov.io/gh/vocalpy/crowsetta/pull/226?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-bm94ZmlsZS5weQ==) | `0.00% <0.00%> (ø)` | | | [tests/test\_data.py](https://codecov.io/gh/vocalpy/crowsetta/pull/226?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-dGVzdHMvdGVzdF9kYXRhLnB5) | `98.40% <0.00%> (-1.60%)` | :arrow_down: | | [tests/fixtures/\_\_init\_\_.py](https://codecov.io/gh/vocalpy/crowsetta/pull/226?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-dGVzdHMvZml4dHVyZXMvX19pbml0X18ucHk=) | `100.00% <0.00%> (ø)` | | | [tests/test\_formats/test\_bbox/test\_raven.py](https://codecov.io/gh/vocalpy/crowsetta/pull/226?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-dGVzdHMvdGVzdF9mb3JtYXRzL3Rlc3RfYmJveC90ZXN0X3JhdmVuLnB5) | `100.00% <0.00%> (ø)` | | | [tests/test\_formats/test\_seq/test\_audtxt.py](https://codecov.io/gh/vocalpy/crowsetta/pull/226?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-dGVzdHMvdGVzdF9mb3JtYXRzL3Rlc3Rfc2VxL3Rlc3RfYXVkdHh0LnB5) | | | | [tests/fixtures/audtxt.py](https://codecov.io/gh/vocalpy/crowsetta/pull/226?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-dGVzdHMvZml4dHVyZXMvYXVkdHh0LnB5) | | | | [tests/test\_formats/test\_seq/test\_audseq.py](https://codecov.io/gh/vocalpy/crowsetta/pull/226?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-dGVzdHMvdGVzdF9mb3JtYXRzL3Rlc3Rfc2VxL3Rlc3RfYXVkc2VxLnB5) | `100.00% <0.00%> (ø)` | | | [tests/fixtures/audseq.py](https://codecov.io/gh/vocalpy/crowsetta/pull/226?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-dGVzdHMvZml4dHVyZXMvYXVkc2VxLnB5) | `88.88% <0.00%> (ø)` | | | [tests/test\_formats/test\_bbox/test\_audbbox.py](https://codecov.io/gh/vocalpy/crowsetta/pull/226?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-dGVzdHMvdGVzdF9mb3JtYXRzL3Rlc3RfYmJveC90ZXN0X2F1ZGJib3gucHk=) | `100.00% <0.00%> (ø)` | | | [tests/fixtures/audbbox.py](https://codecov.io/gh/vocalpy/crowsetta/pull/226?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-dGVzdHMvZml4dHVyZXMvYXVkYmJveC5weQ==) | `88.88% <0.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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[NickleDave]

@all-contributors please add @shaupert for code ideas

[allcontributors[bot]]

@NickleDave

I've put up a pull request to add @shaupert! :tada: