[ANN] mlfront-shell - reference implementation of a build system

Ecosystem
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There have been many improvements since the last update. Here are some of them:

  1. The trace store (needed to not rebuild everything from scratch) has been implemented.
  2. Build file ASTs are parsed, marshalled and put into a key-value directory (which can be shared or cached in CI).
  3. Build keys are generated and used to protect sharing of the parsed AST.
  4. A full walkthrough of “building” the 7zip executable from 7zip binary assets (it is more complicated than it sounds) is on the documentation page
  5. An –autofix option to update build files with checksums, and allowing SHA1 checksum for local files (both are for eventual support of Meta’s watchman tool)
  6. A new format for the JSON files (many functions versus one). The old format is deprecated.
  7. Many many bug fixes, including specification updates.