Remove jQuery and underscore dependencies

- replace $.each with .forEach
- replace _.each with .forEach
- replace _.isFunction with typeof comparison

overviewer_core/data/web_assets/index.html

@@ -8,8 +8,6 @@
 <meta name="generator" content="Minecraft-Overviewer {version}" />
 <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
 
-<script type="text/javascript" src="jquery.min.js"></script>
-
 <script type="text/javascript" src="overviewerConfig.js"></script>
 <script type="text/javascript" src="overviewer.js"></script>
 <script type="text/javascript" src="baseMarkers.js"></script>