Update web, websocket servers for recent actor changes.

* 8sync/systems/web.scm (<web-server>): Remove *init* and *cleanup*
action handlers.
(actor-init!, actor-cleanup!): Add method definitions for <web-server>.
(web-server-socket-loop, web-server-client-loop): Use
with-actor-nonblocking-ports.
(web-server-client-loop): Removed.
* 8sync/systems/websocket/server.scm (websocket-client-loop)
(websocket-server-send): Wrap I/O behavior in with-actor-nonblocking-ports.