archerU

// this function will work cross-browser for loading scripts asynchronously
function loadScript(src) {
  return new Promise(function(resolve, reject) {
    const s = document.createElement('script');
    let r = false;
    s.type = 'text/javascript';
    s.src = src;
    s.async = true;
    s.onerror = function(err) {
      reject(err, s);