hg-core: add basic config module The config module exposes a `Config` struct, unused for now. It only reads the config file local to the repository, but handles all valid patterns and includes/unsets. It is structured in layers instead of erasing by reverse order of precedence, allowing us to transparently know more about the config for debugging purposes, and potentially other things I haven't thought about yet. This change also introduces `format_bytes!` to `hg-core`. Differential Revision: https://phab.mercurial-scm.org/D9408

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// config.rs

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//

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// Copyright 2020

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//      Valentin Gatien-Baron,

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//      Raphaël Gomès <rgomes@octobus.net>

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//

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// This software may be used and distributed according to the terms of the

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// GNU General Public License version 2 or any later version.

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//! Mercurial config parsing and interfaces.

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mod config;

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mod layer;

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pub use config::Config;