resolve: add confirm config option
This config setting gives a functionality to confirm before
it re-merge all unresolved files. If this config is enabled,
when you run 'hg resolve --all' it will prompt with a msg
"re-merge all unresolved files (yn)?"
To enable this functionality:
[commands]
resolve.confirm = True
Differential Revision: https://phab.mercurial-scm.org/D3988
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