implement server and client player join/leave notifications

include/client/handlers/PlayerListHandler.h

@@ -0,0 +1,18 @@
+#include <blitz/protocol/PacketHandler.h>
+
+namespace blitz {
+namespace client {
+
+class PlayerListHandler : public protocol::PacketHandler {
+  public:
+	PlayerListHandler(network::EnetConnection& a_Connection, EnttWorld& a_World);
+	~PlayerListHandler();
+
+	NazaraSlot(network::EnetConnection, OnPlayerList, m_Slot);
+
+  private:
+	void Handle(const protocol::data::PlayerList&);
+};
+
+}  // namespace client
+}  // namespace blitz