Add URL params parsing and concept of "embedded mode"

webassets/js/spots.js

@@ -295,6 +295,11 @@ function loadOptions() {
         })));
         $("#spots-to-fetch").val(options["web-ui-options"]["spot-count-default"]);
 
+        // Load URL params. These may select things from the various filter & display options, so the function needs
+        // to be called after these are set up, but if the URL params ask for "embedded mode", this will suppress
+        // loading settings, so this needs to be called before that.
+        loadURLParams();
+
         // Load settings from settings storage now all the controls are available
         loadSettings();