* ADD: Dynamic tags: Available units count, Bookings count;
* ADD: Additional custom labels;
* UPD: Allow filtering settings value before return with `'jet-booking/settings/get/' . $setting-key`;
* UPD: Custom labels default value initialization;
* FIX: Order of advanced prices application;
* FIX: `check-in-out` field searched dates;
* FIX: Dynamic tag price per day/night;
* FIX: Advanced price popups data duplication;
* FIX: Filter result with Checkout only option.