Checkdmarc

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- Account for float SVG sizes

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- Properly parse a certificate SAN
- Certificate warnings fire properly
- Make the `expires` timestamp more readable

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`checkdmarc` will now validate Verified Mark Certificates (VMCs) and Common Mark Certificates (CMC),
snd will verify that SHA256 hash of the logo embedded in the certificate matches the SHA256 hash
logo at the URL at the BIMI `l` tag.

Additionally, SVG and certificate metadata is now included in the `checkdmarc.bimi.parse_bimi_record()` API and
JSON CLI output.

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- Add a warning when BIMI records do not provide a mark certificate
- Ude the correct dependency (`xmltodict`, not `xml2dict`)

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- Fix SVG base profile detection

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- Automatically check for a BIMI DNS record at the `default` selector when using the CLI
- Fix parsing of BIMI record tags when they are separated by a `;` without a space
- Validate the file at the URL in the BIMI `l` tag value
- Must be an SVG file
- The SVG version must be `1.2`
- The SVG base profile must be `tiny-ps`
- The SVG dimensions must be square
- The file size must not exceed 32 KB

**Note**: This does not currently include certificate validation.