Replace shapeless with magnolia in (semi?)auto

[MateuszKubuszok]

[pk044]

the tests for your implementation in the magnolia-impl branch you made seem to pass after updating Magnolia to the newest version.

Shapeless is not removed though, so I could do it and make a pull request in the evening, unless you perhaps would like some more changes to be done? :)

[MateuszKubuszok]

I believe shapeless can be removed if magnolia works fine :)