Check UTF-8 encoding, and convert strings to UTF-8

Handle conversion errors properly by inserting � instead.  Add a binary
header to provide portable way to write binary literals (I like them) Also
add a test file.  ref #2404

src/main.cpp

@@ -1,31 +1,16 @@
-#include <irc/irc_client.hpp>
-#include <xmpp/xmpp_component.hpp>
 #include <network/poller.hpp>
-
-#include <xmpp/xmpp_parser.hpp>
-#include <xmpp/xmpp_stanza.hpp>
+#include <xmpp/xmpp_component.hpp>
 
 #include <memory>
 
-#include <xmpp/jid.hpp>
-#include <irc/iid.hpp>
-
-#include <iostream>
-
 int main()
 {
   Poller p;
-  // Now I'm the bridge, creating an ircclient because needed.
-  std::shared_ptr<IrcClient> c = std::make_shared<IrcClient>();
-  p.add_socket_handler(c);
-  std::shared_ptr<IrcClient> d = std::make_shared<IrcClient>();
-  p.add_socket_handler(d);
-  std::shared_ptr<IrcClient> e = std::make_shared<IrcClient>();
-  p.add_socket_handler(e);
-  c->connect("localhost", "7877");
-  d->connect("localhost", "7878");
-  e->connect("localhost", "7879");
-  while (true)
-    p.poll();
+  std::shared_ptr<XmppComponent> xmpp_component =
+    std::make_shared<XmppComponent>("irc.localhost", "secret");
+  p.add_socket_handler(xmpp_component);
+  xmpp_component->start();
+  while (p.poll())
+    ;
   return 0;
 }