* Prevent auto conversion of png to jpg images
* Create red-swans-march.md
* Update transformation tests
* Update blackbox test
* Fix image allocation
* Fix test again :-)
* Convert formats with transparency support to png (if no accept header)
* Update tests & add final fallback
* Update changeset
* Update blackbox test
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Co-authored-by: rijkvanzanten <rijkvanzanten@me.com>