fix typescript typings, code cleanup, docs updated

docs/index.html

@@ -170,7 +170,7 @@
       <img class="logo" src="assets/logo.png" alt="logo">
       <div class="title">systeminformation</div>
       <div class="subtitle"><span id="typed"></span>&nbsp;</div>
-      <div class="version">New Version: <span id="version">5.12.8</span></div>
+      <div class="version">New Version: <span id="version">5.12.9</span></div>
       <button class="btn btn-light" onclick="location.href='https://github.com/sebhildebrandt/systeminformation'">View on Github <i class=" fab fa-github"></i></button>
     </div>
     <div class="down">
@@ -403,4 +403,4 @@
   </script>
 </body>
 
-</html>
+</html>