Add clusterio module with API for lua code

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

test/lib/luaTools.js

@@ -0,0 +1,30 @@
+const assert = require('assert').strict;
+
+const luaTools = require('lib/luaTools');
+
+
+describe("lib/luaTools", function() {
+	describe("escapeString()", function() {
+		it("should escape backslashes", function() {
+			assert.equal(luaTools.escapeString("\\a"), "\\\\a");
+		});
+		it("should escape double quotes", function() {
+			assert.equal(luaTools.escapeString('"a"'), '\\"a\\"');
+		});
+		it("should escape single quotes", function() {
+			assert.equal(luaTools.escapeString("'a'"), "\\'a\\'");
+		});
+		it("should escape nul bytes", function() {
+			assert.equal(luaTools.escapeString("a\0b"), "a\\0b");
+		});
+		it("should escape newlines", function() {
+			assert.equal(luaTools.escapeString("a\nb"), "a\\nb");
+		});
+		it("should escape carriage return", function() {
+			assert.equal(luaTools.escapeString("a\rb"), "a\\rb");
+		});
+		it("should escape all combined", function() {
+			assert.equal(luaTools.escapeString("a\\b\"c'd\0e\nf\rg"), "a\\\\b\\\"c\\'d\\0e\\nf\\rg");
+		});
+	});
+});