Pass a starttime/endtime-based lifetime to the new CacheTag API

You already switched to the CacheTag API for core version 13, in \GeorgRinger\News\Utility\Cache.

This API supports passing lifetimes per tag. You can pass, pseudo-code!, ($news->getStartime() ?: $news->getEndtime()) - $now (only if any is set) to respect the start and end times of news records on-the-fly. Then all news lists and detail pages should automatically respect these enabled fields implicitly without having to deal with TypoScript cache settings or implementing custom solutions.