.editorconfig

typing: add type annotations to mercurial/utils/dateutil.py

For now, I'm just typing around the edges to help find issues with TortoiseHg.
If the custom `hgdate` type is useful elsewhere as I go, I'll move it to a file
dedicated to custom types.  I'm not loving the ban on camelcase type names here
that test-check-code.t flagged, but I'm not sure how to disable that even if
everyone agreed that it's a bad idea to go against the normal convention for
types.

While here, fix an issue that pytype found in `parsedate` when an invalid date
tuple is passed by raising a ProgrammingError instead of crashing.  (Tuple
doesn't have a `strip` attribute.)

Differential Revision: https://phab.mercurial-scm.org/D10123

# See http://EditorConfig.org for the specification

root = true

[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
end_of_line = lf

[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
end_of_line = lf

[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false
end_of_line = lf