Added ability to never cache twig.

[rhukster]

This makes it possible to cache content, but always process twig. Useful for regular but especially modular pages.

never_cache_twig: true

Enabling this will allow you to add a processing logic that can change dynamically on each page load, rather than caching the results and storing it for each page load.

This can be enabled/disabled site-wide in the system.yaml, or on a specific page.

This allows twig logic to be processed on every page load even if the page is a modular subpage. This is similar to disabling the cache completely, however, cache is still used to store the regular content that has been processed by markdown, plugins, etc. So performance is better than disabling the cache, but not as good as caching content+twig processing.

NOTE: This is not compatible with twig_first: true currently because all processing is happening in the one Twig call.

It might be possible to refactor the twig processing to handle page processing and modular processing independently. I can look at this later.

Please test!

[flaviocopes]

Tested