templates: extract function to `stringutil` for getting first line of text
It's surprisingly hard to get the first line from a string, so let's
have our own function in `stringutil` for it.
Differential Revision: https://phab.mercurial-scm.org/D12404
[build-system]
requires = ["setuptools", "wheel"]
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true