we remove the plural forms and simplify the adapter
and serializers to fix the chat

The old README was mostly outdated information and didn't really
explain the project very well.  Added project scope and component
outline, as well as a technical overview.  Most of the components
documentation will also have to be adjusted.

git-subtree-dir: docs/website
git-subtree-mainline: ba55338b
git-subtree-split: 6ed1df17

git-subtree-dir: utils/robohash-rs
git-subtree-mainline: 8bbf0e12
git-subtree-split: 5851fa8f

git-subtree-dir: utils/opus-rs
git-subtree-mainline: b0d6d5a1
git-subtree-split: 827d70c6

git-subtree-dir: utils/libopus-sys
git-subtree-mainline: 26757a0d
git-subtree-split: c57b98cb

By default connections are greated bi-directionally between two
peers.  This has the advantage of being able to read and write at the
same time, but might not be suported on all networks.  As a fallback
this commit implements reverse connection logic via the same stream as
an incoming connection.

A user can specify a peer in the peer list with "limited" connection
mode (example: 10.20.30.40:1312 limited), which will indicate in the
opening handshake to the server to re-use the incoming TcpStream as
the outgoing stream to the peer.

This way clients that can't be reached via an open upnp port (because
their network doesn't support this) can still use netmod-tcp to peer.

This is an issue when a connection is uni-directional (usually because
the reverse connection is blocked by a firewall or non-forwarded point).

The solution to this problem has been to send explicit hello-responses
from the receiving stream end.  When sending a HELLO a task tries to
read from the sending stream to wait for an ACK.  If this response
times out (TODO: make these values configurable), it will officially
drop the sending connection, meaning that the next send re-initialises
the stream.

With some initial testing this has shown _most_ connection drops to
recover gracefully, but not all.  Further testing is required.

Problem now is that it only works every _other_ re-connect