Summary: This makes it an entirely PHP-only linter implementation, similar in setup to the PHPAST linter found in arcanist. Ref T15123 Test Plan: * Run `./support/peast/build-peast.php` * Remove all linters but `javelin` from .arclint * Run arc lint --everything --never-apply-patches * Observe (lack of) lint violations (Optional:) * Compile javelinsymbols from source using instructions in T15123 * Put it in $PATH * Observe the futility of your effort because javelinsymbols (or more precise, libfbjs) cannot parse the JS in Phorge * And even if it could, the lint violations are beligerent and numerous Reviewers: O1 Blessed Committers, avivey Reviewed By: O1 Blessed Committers, avivey Subscribers: avivey, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno Maniphest Tasks: T15123 Differential Revision: https://we.phorge.it/D26774