Summary

Gives a more helpful error for DCv1 import issues
When the user gives an ambigous -t target, clarify if some of the options are Groups or not
Update the regex for !campaign links
Don't import attack descriptions that are straight up "If you're proficient, add proficiency!"

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Checklist

PR Type

• This PR is a code change that implements a feature request.
• This PR fixes an issue.
• This PR adds a new feature that is not an open feature request.
• This PR is not a code change (e.g. documentation, README, ...)

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• This PR is a breaking change (e.g. methods or parameters removed/renamed)
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