remove aquatic_common_tcp crate, move contents into aquatic_http

It doesn't make a lot of sense to make a separate crate for
the few things here. I don't really want tight coupling between
the crates anyway, since it impedes making changes in them
and makes understanding them more difficult.

aquatic_http/src/lib/network/connection.rs

@@ -8,11 +8,12 @@ use mio::Token;
 use mio::net::TcpStream;
 use native_tls::{TlsAcceptor, MidHandshakeTlsStream};
 
-use aquatic_common_tcp::network::stream::Stream;
 use aquatic_http_protocol::request::{Request, RequestParseError};
 
 use crate::common::*;
 
+use super::stream::Stream;
+
 
 #[derive(Debug)]
 pub enum RequestReadError {