rust-cpython: start cpython crate bindings This changeset introduces the hg-cpython crate, that compiles as a shared library holding a whole Python package (mercurial.rustext), with only the empty 'ancestor' submodule for now. Such bindings will be easier and safer to develop and maintain that those of `hg-direct-ffi`. They don't involve C code, only unsafe Rust that's mostly isolated within the cpython crate. The long-term goal would be to import the provided modules, such as rustext.ancestor with mercurial.policy.importmod, same as we already do with cext modules. Differential Revision: https://phab.mercurial-scm.org/D5434

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

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root = true

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[*.py]

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indent_size = 4

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indent_style = space

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trim_trailing_whitespace = true

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[*.{c,h}]

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indent_size = 8

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indent_style = tab

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trim_trailing_whitespace = true

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[*.t]

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indent_size = 2

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indent_style = space

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trim_trailing_whitespace = false