Add clusterio module with API for lua code

Add a shared API for lua code through a module named clusterio.

lib/luaTools.js

@@ -0,0 +1,17 @@
+/**
+ * Escapes a string for inclusion into a lua string
+ */
+function escapeString(content) {
+	return content
+		.replace(/\\/g, "\\\\")
+		.replace(/"/g, '\\"')
+		.replace(/'/g, "\\'")
+		.replace(/\0/g, "\\0")
+		.replace(/\n/g, "\\n")
+		.replace(/\r/g, "\\r")
+	;
+}
+
+module.exports = {
+	escapeString,
+}