Allow node names with mixed colons and dashes

[gbj]

This is a somewhat stupid attempt, but tests pass. It just merges the Colon and Dash variants, and then checks for either a Colon or Dash when it peeks, rather than passing in an allow-list or doing something more generic. I don't think any other punctuation actually ever needs to be included here, so maybe it's fine.

Fixes #33

[stoically]

Thanks for working on this. Was trying to find a generic way to solve this to avoid duplication, but couldn't find one either without upstream work. So I'm going ahead and merge this, maybe something pops up in the future.

Was also thinking whether it might make sense to keep the Dash variant for consumers that only want to support dashes, but I guess they could also just check the punctuated variant accordingly.

In terms of HTML spec the attribute name is very flexible, you could basically have almost anything as name. Even something like ::: or what ever: https://stackoverflow.com/a/53563849. That's if you ignore that the spec officially only allows a specific set of attribute names. But I think : and - is fine for a start. If someone needs more, they could always open an issue.

[stoically]

Published as v0.9.0-beta.2.