Introduce the network module prototype

lib_net/README.md

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+# Networking Library
+
+Folder: `./lib_net/`
+
+Status: Prototype, in review stage
+
+* This directory contains the Ecstasy code for the standard `net.xtclang.org` module.
+* This is not part of the build yet, and is unlikely to compile without the various
+  minor edits that one would expect to have to perform to get new code to compile.
+* This library is intended to serve the `web.xtclang.org` module (and anything else that
+  needs network communication), but the web module is still undergoing significant
+  refactoring.
+
+Example code:
+
+    // the basic idea is that, for the most part, it will be possible to rely on the
+    // network implementations to be injected
+    @Inject Network network; 
+    @Inject Network secureNetwork;      // for SSL/TLS connections 
+
+    assert ServerSocket listenerHTTP  := network.listen((IPv6Any, 80));
+    assert ServerSocket listenerHTTPS := secureNetwork.listen((IPv6Any, 443));

lib_net/src/main/x/net.x

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+/**
+ * The Ecstasy standard module for basic networking support.
+ */
+module net.xtclang.org
+    {
+    /**
+     *
+     */
+    typedef Tuple<String|IPAddress, UInt16> as HostPort;
+
+    /**
+     *
+     */
+    typedef Tuple<IPAddress, UInt16> as SocketAddress;
+    }