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- network thread is able to wakeup directly the blocked threads
- reduce the number of context switches

- acquire don't longer expect an absolute time as argument
- a maximum delay from calling the function is passed

* Refactor: Fix Clippy warnings

- Added support for empty println!()
- use short hand initialization when possible
- replace if x==false with if !x
- replace unwrap_or(function_call()) with unwrap_or_else(|| function_call())
- and others

* Update to Rust edition 2018
 - Mostly just adds crate::

- rename old virtio-fs driver
- introduce memory barriers

- use for all kernel functions the kernel stack

- move interrupt handler to net/mod.rs

Port over the lwIP-based network stack along with an Intel E1000 driver from the HermitCore C version.

I have built some Rust helper functions around lwIP to make it more comfortable and split up the lwIP network interface from the E1000 network adapter.
However, using the lwIP C library requires many unsafe blocks and usage of raw pointers.

This is still untested and requires the scheduler implementation first.