Fix require_once deprecation in action.php

- Remove deprecated require_once() call - use autoloading instead
- Fix header comment to correctly identify as Ditaa Plugin - Action Component
- Fixes PHP

Fix require_once deprecation in action.php

- Remove deprecated require_once() call - use autoloading instead
- Fix header comment to correctly identify as Ditaa Plugin - Action Component
- Fixes PHP 8+ deprecation warnings

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cleanup and better way of passing data between stages

Use an action plugin instead of the simple img.php

The problem was that the rendered ditaa file disappeared with the cache
and was not re-rendered when accessed. Now we bind the ditaa to the
current

Use an action plugin instead of the simple img.php

The problem was that the rendered ditaa file disappeared with the cache
and was not re-rendered when accessed. Now we bind the ditaa to the
current page, via metadata, and access it via the md5 hash. This way we
can easily create the image without knowing if the page still has a
valid cache file for the ditaa (we simply recreate that as needed).

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