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

tools/grammars/compiler/cson.go

@@ -0,0 +1,21 @@
+package compiler
+
+import (
+	"bytes"
+	"os/exec"
+)
+
+func ConvertCSON(data []byte) ([]byte, error) {
+	stdin := bytes.NewBuffer(data)
+	stdout := &bytes.Buffer{}
+
+	cmd := exec.Command("csonc")
+	cmd.Stdin = stdin
+	cmd.Stdout = stdout
+
+	if err := cmd.Run(); err != nil {
+		return nil, err
+	}
+
+	return stdout.Bytes(), nil
+}