Tidy

- Move some scripts to their own js files
- Move some duplicate code blocks to functions
- General tidy & spacing cleanups (#538)

settings_backup.php

@@ -1,4 +1,5 @@
-<?php require_once("inc_all_settings.php"); ?>
+<?php
+require_once("inc_all_settings.php"); ?>
 
     <div class="card card-dark mb-3">
         <div class="card-header py-3">
@@ -30,4 +31,5 @@
         </div>
     </div>
 
-<?php require_once("footer.php");
+<?php
+require_once("footer.php");