RIOT summit configurations breakout session summary

Dear RIOT kernel developers,

I just posted the summary [1] of the **configurations breakout session** we had in the RIOT summit.

In conclusion, we agreed in starting small and work first in per-module config declarations in header files. Further steps might include tools on top for handling dependencies, GUIs, etc.

Please check the summary for the minute and the detailed outcome. @leandrolanzieri offered to open a RFC/PR soon with a POC so we can continue the discussion there.

Already posted the Youtube video in the issue, but I do it again here [2].