Add OpenStreetMap fullscreen widget

functions/classes/class.OpenStreetMap.php

@@ -188,6 +188,8 @@ class OpenStreetMap extends Common_functions {
         ?>
         <link rel="stylesheet" href="https://unpkg.com/leaflet@1.7.1/dist/leaflet.css" integrity="sha512-xodZBNTC5n17Xt2atTPuE1HxjVMSvLVW9ocqUKLsCC5CXdbqCmblAshOMAS6/keqq/sMZMZ19scR4PsZChSR7A==" crossorigin=""/>
         <script src="https://unpkg.com/leaflet@1.7.1/dist/leaflet.js"                  integrity="sha512-XQoYMqMTK8LvdxXYG3nZ448hOEQiglfqkJs1NOQV44cWnUrBc8PkAOcXy20w0vlaXaVUearIOBhiXZ5V3ynxwA==" crossorigin=""></script>
+        <link rel="stylesheet" href='https://api.mapbox.com/mapbox.js/plugins/leaflet-fullscreen/v1.0.1/leaflet.fullscreen.css' integrity="sha512-Tbna5DrK+N26ZZczWjdHj7BHyU3vUAjA7JsGhIyTM/7jBiy4f4DbiScuLQxaxB51+Gh/+a+Z7AwQmh2FyafjLg==" crossorigin=""/>
+        <script src='https://api.mapbox.com/mapbox.js/plugins/leaflet-fullscreen/v1.0.1/Leaflet.fullscreen.min.js'              integrity="sha512-gyvCiKy2sIRwqd5QeTyyeJBTPx5OQdyluEFSIe1KnKDi0DM0w/T+T8iczSYRRcwmMYGVixYL2QGKJ+8XylbyTA==" crossorigin=""></script>
 
         <div style="width:100%; height:<?php print isset($height) ? $height : "600px" ?>;" id="map_overlay">
             <div id="osmap" style="width:100%; height:100%;"></div>
@@ -221,6 +223,7 @@ class OpenStreetMap extends Common_functions {
                 preferCanvas: true,
                 attributionControl: true,
                 zoom: -1,
+                fullscreenControl: true,
             }
 
             var geoJSONOptions = {