Advanced Ads Pro 2.26.1

- Improvement: implemented PHP-based "Custom Position" and "Above Headline" placements
- Fix: prevent PHP 8 deprecation notices
- Fix: remove obsolete code for handling groups in cache-busting

- Improvement: disable cache-busting for Custom Position placements with static ads
- Fix: prevent encoding of cookie values and regular expressions for cookie visitor conditions

- Feature: add the "post content" display condition
- Improvement: update German and Arabic translations
- Fix: reset page impressions number when the cookie that stores it expires