New Grammars Compiler (#3915)

* grammars: Update several grammars with compat issues

* [WIP] Add new grammar conversion tools

* Wrap in a Docker script

* Proper Dockerfile support

* Add Javadoc grammar

* Remove NPM package.json

* Remove superfluous test

This is now always checked by the grammars compiler

* Update JSyntax grammar to new submodule

* Approve Javadoc license

* grammars: Remove checked-in dependencies

* grammars: Add regex checks to the compiler

* grammars: Point Oz to its actual submodule

* grammars: Refactor compiler to group errors by repo

* grammars: Cleanups to error reporting

script/grammar-compiler

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+set -e
+cd "$(dirname "$0")/.."
+
+image="linguist/grammar-compiler:latest"
+mkdir -p grammars
+
+exec docker run --rm \
+    -u $(id -u $USER):$(id -g $USER) \
+    -v $PWD:/src/linguist \
+    -w /src/linguist -ti $image "$@"