MAPG-180 extract all inline JS into separate JS file

public/static/js/maps_admin.js

@@ -0,0 +1,34 @@
+(function () {
+    Maps = {
+        deleteMap: function (mapId, mapName) {
+            MapGuesser.showModalWithContent('Delete map', 'Are you sure you want to delete map \'' + mapName + '\'?', [{
+                type: 'button',
+                classNames: ['red'],
+                text: 'Delete',
+                onclick: function () {
+                    document.getElementById('loading').style.visibility = 'visible';
+
+                    MapGuesser.httpRequest('POST', '/admin/deleteMap/' + mapId, function () {
+                        if (this.response.error) {
+                            document.getElementById('loading').style.visibility = 'hidden';
+
+                            //TODO: handle this error
+                            return;
+                        }
+
+                        window.location.reload();
+                    });
+                }
+            }]);
+        }
+    };
+
+    var buttons = document.getElementById('mapContainer').getElementsByClassName('deleteButton');
+    for (var i = 0; i < buttons.length; i++) {
+        var button = buttons[i];
+
+        button.onclick = function () {
+            Maps.deleteMap(this.dataset.mapId, this.dataset.mapName);
+        };
+    }
+})();