List and Union mime-like representations

[tclose]

• adds the ability to convert lists and unions of fileformat types to mime-like strings
• Removes the MissingDependency exception handling (dependencies should be referenced in *-extras packages)
• Renames fileformats.text.Txt to fileformats.text.TextFile
• Updates docs to remove references to extended dependencies

[codecov[bot]]

Codecov Report

Patch coverage: 91.66% and project coverage change: +0.01% :tada:

Comparison is base (6a5ac23) 93.11% compared to head (4336e49) 93.13%. Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #29 +/- ## ========================================== + Coverage 93.11% 93.13% +0.01% ========================================== Files 30 30 Lines 4257 4269 +12 Branches 411 420 +9 ========================================== + Hits 3964 3976 +12 Misses 225 225 Partials 68 68 ``` | [Files Changed](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/29?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework) | Coverage Δ | | |---|---|---| | [fileformats/core/\_\_init\_\_.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/29?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvY29yZS9fX2luaXRfXy5weQ==) | `100.00% <ø> (ø)` | | | [fileformats/core/exceptions.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/29?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvY29yZS9leGNlcHRpb25zLnB5) | `100.00% <ø> (ø)` | | | [fileformats/core/fileset.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/29?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvY29yZS9maWxlc2V0LnB5) | `85.71% <0.00%> (-0.31%)` | :arrow_down: | | [fileformats/serialization/\_\_init\_\_.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/29?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvc2VyaWFsaXphdGlvbi9fX2luaXRfXy5weQ==) | `75.92% <ø> (-0.44%)` | :arrow_down: | | [fileformats/core/utils.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/29?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvY29yZS91dGlscy5weQ==) | `78.01% <100.00%> (+3.39%)` | :arrow_up: | | [fileformats/text/\_\_init\_\_.py](https://app.codecov.io/gh/ArcanaFramework/fileformats/pull/29?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ArcanaFramework#diff-ZmlsZWZvcm1hdHMvdGV4dC9fX2luaXRfXy5weQ==) | `100.00% <100.00%> (ø)` | |

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