Add frontend assets and plugin bundles

Add the legacy frontend themes, scripts, and plugin assets required by the main SPOTA interfaces.

assets/plugins/gmaps/lib/gmaps.styles.js

@@ -0,0 +1,9 @@
+GMaps.prototype.addStyle = function(options) {
+  var styledMapType = new google.maps.StyledMapType(options.styles, options.styledMapName);
+
+  this.map.mapTypes.set(options.mapTypeId, styledMapType);
+};
+
+GMaps.prototype.setStyle = function(mapTypeId) {
+  this.map.setMapTypeId(mapTypeId);
+};