* ADD: Settings page for Ajax Search widget, enabling customization of default Ajax Search settings;
* ADD: `Search Query Save to Search Suggestions` control in the Ajax Search widget;
* ADD: `Disable Submit on Enter` control in the Ajax Search widget;
* ADD: `jet-search/query/set-search-query` hook, allow to filter search query;
* ADD: `Custom Search Results URL` control in the Ajax Search widget for page link where search results will be displayed;
* ADD: Allow specific tags for Notifications;
* FIX: minor issues.