WebHare 5.6 released - with AVIF/WEBP and TypeScript 5.6

[Arnold Hendriks]

5.6 has now been released and the release notes have been updated, see https://www.webhare.dev/reference-next/release-notes/5.6/

For CI purposes, we now consider WebHare 5.5 to be 'stable', 5.6 to be 'beta' and 5.7 to be the 'master' version. 

The most important change is the addition of AVIF/WEBP support in the image cache, and Brotli compression for assetpacks. Both should help improve page load metrics.

A lot of form internals have changed so you should be verify this after updating, especially if you're using uploading components (upload and imgedit). See also https://www.webhare.dev/blog/formapi-changes/ and of course the release notes

Go ahead and test!