hgweb: convert {diff} to a mappinggenerator with named template
No more bare generator. Fortunately, this one is associated with a single
template, so it can be a mappinggenerator.
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true