match: drop support for passing '.' for root dir to visit*() methods
We said we'd drop support for it after 5.1, so it's time to clean it
up now.
Differential Revision: https://phab.mercurial-scm.org/D7249
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IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2