Allow conditional section to match any value from comma-seperated list

[jakubmirejovsky]

Summary

Allow conditional section to match any value from comma-seperated list.
Prior to this, conditional groups only allowed matching ONE option (eg. from a select dropdown). This should allow matching multiple options.
Useful when you need to show a conditional section based on a select dropdown where more than one option satisfy the condition.

Summarize the changes briefly, including which issue/ticket this resolves. If it closes an existing Github issue, include "Closes #[issue number]"

What are the specific steps to test this change?

What kind of change does this PR introduce?

(Check at least one)

• Bug fix
• New feature
• Refactor
• Documentation
• Build-related changes
• Other

Make sure the PR fulfills these requirements:

• It includes a) the existing issue ID being resolved, b) a convincing reason for adding this feature, or c) a clear description of the bug it resolves
• The changelog is updated
• Related documentation has been updated
• Related tests have been updated

Other information:
Needs to be tested properly.

[boutell]

Thank you for this contribution. One concern that occurs to me is that someone could be counting on that comma as part of the value they want to match right now, it's not that common but it would be a backwards compatibility break. Another is that we're not doing anything to help them pick a valid value, but that's actually not new. @abea what do you think?

[abea]

It is a BC break, as much as I'd like to lean on any problems from it being very rare. A module option (documented) that allows comma separated conditions would resolve it.