templater: add special "self" variable to refer to top-level object #3132
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I'm going to introduce the "self" variable, and it will make more sense to document keywords as methods of the self object type.
This allows us to call alias function with the top-level object. For convenience, all self.<method>()s are available as keywords. I don't think we'll want to deprecate them. It would be tedious if we had to specify -T'self.commit_id()' instead of -Tcommit_id.
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Checklist
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CHANGELOG.md