Y16 support

This PR updates the exosense collection to use a 3.8 Linux Kernel. Moreover, all Erlang recipes and helpers were updated to work with more recent versions of Erlang and make it easier to build Erlang applications.

I also made most recipes use specific Git hashes to ensure a deterministic build at any time.

This change still uses some repository clones on my account. I'd like to merge this first before doing a final change of all clones.