Unzipwalk

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- Added `--outfile` CLI option

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`commit 43e2481c8ae71733d84b930ad989db67ce6cb5d2`

- Added `raise_errors` option that can be turned off so that errors during iteration don't abort the walk,
and instead a `UnzipWalkResult` of type `FileType.ERROR` is yielded.
- **Warning: Potentially incompatible changes**
- When `matcher` is used, previously the results would be entirely suppressed, now a `UnzipWalkResult` of type `FileType.SKIP` is yielded.
- The CLI tool now defaults to `raise_errors` being off; you must specify `--raise-errors` to get the previous behavior.
- The CLI tool now defaults to reporting `ERROR` and `FILE` results instead of just `FILE` results.
- Package `unzipwalk` now has a `__main__.py` so you can invoke the CLI tool with `python3 -m unzipwalk` as well

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`commit c0069e6c6cc20438b70865777b8ca97e8e0dca96`

- Made requirements more lenient to avoid dependency conflicts

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`commit 11e5d41703e50348f68410121b078afdcbe30f43`

- Further improved escaping of filenames with `--checksum` CLI option,
and provided `UnzipWalkResult.from_checksum_line()` to parse the output.

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`commit e3f8275b7150fd84c7e2a5ca7d7d45c991f6fcee`

- Improved escaping of filenames with `--checksum` CLI option.

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`commit b9fd55222886dd3e074ea374dbd901f9024ee497`

- Added `matcher` argument to `unzipwalk()` and corresponding `--exclude` CLI option.