Switch to es6 modules and rename tw-sanitize to tw-safe-stringify

Author: CubesterYT

src/lib/tw-sanitize.js src/lib/tw-safe-stringify.jssrc/lib/tw-sanitize.js renamed to src/lib/tw-safe-stringify.js

@@ -27,6 +27,4 @@ const sanitizeVariableType = (input, type) => {
   }
 };
 
-module.exports = {
-  sanitizeVariableType
-};
+export { sanitizeVariableType };