WIP: Fix/networking

[CarlWachter]

This a WIP collection of networking related fixes.

• Some changes had to be reversed, as they did not work as expected
• inet_pton was added

In the current state hermit-playground can run as a tcp server, with a transfer speed of roughly 100 Mbit/s

What still needs to be done

• arpa/inet.h needs to be restored to it's expected form, this is still an open issue from removing lwip
• inet_pton does not work properly or the sockets can not listen properly
• UDP Ports can not be opened currently

@mkroening this may be of interest for hermit-c, but i do not expect to fix this in the context of my thesis