feat(newlib): using kernel networking, instead of lwip

[CarlWachter]

Adapted cfg to now use kernel networking with newlib feature.

Closes #1165

[mkroening]

There is some overlap with #1165. Could you integrate those changes and test? :)

[CarlWachter]

There is some overlap with #1165. Could you integrate those changes and test? :)

I cherry-picked the commits in question and everything still works 👍

[mkroening]

I cherry-picked the commits in question and everything still works 👍

Awesome, could you remove the merge commit? :)

[CarlWachter]

Awesome, could you remove the merge commit? :)

Done. I spent half an hour looking for it this morning, turns out i accidentally hit "Update branch" on Github and never pulled the change to my local, so i was searching for something that didn't exist :)