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.geofences.js

@@ -0,0 +1,14 @@
+GMaps.prototype.checkGeofence = function(lat, lng, fence) {
+  return fence.containsLatLng(new google.maps.LatLng(lat, lng));
+};
+
+GMaps.prototype.checkMarkerGeofence = function(marker, outside_callback) {
+  if (marker.fences) {
+    for (var i = 0, fence; fence = marker.fences[i]; i++) {
+      var pos = marker.getPosition();
+      if (!this.checkGeofence(pos.lat(), pos.lng(), fence)) {
+        outside_callback(marker, fence);
+      }
+    }
+  }
+};