Allow spaces in BEAST annotations

[watronfire]

Spaces can be included in discrete states reconstructed by BEAST, even if they aren't proper according to NEXUS specs.

Description of proposed changes

I've added a space to the regexes for comments, strings in comments, and sets in comments.

Related issue(s)

Resolves: #1609

Checklist

• [ ] Automated checks pass
• [ ] Check if you need to add a changelog message
• [ ] Check if you need to add tests
• [ ] Check if you need to update docs

[watronfire]

Yeah, glad to help out! Let me know if that changelog message is alright?

[jameshadfield]

Thanks Nate - I merged in the changes here via #1615 in order to resolve some merge conflicts.

We typically make an augur release every week or so, so it shouldn't be too long before your changes are in the release version