fully implement KeepAlive behavior

include/client/handlers/KeepAliveHandler.h

@@ -0,0 +1,15 @@
+#include <blitz/protocol/PacketHandler.h>
+
+namespace blitz {
+namespace client {
+
+class KeepAliveHandler : public protocol::PacketHandler {
+  public:
+	KeepAliveHandler(network::EnetConnection& a_Connection, EnttWorld& a_World);
+	~KeepAliveHandler();
+
+	NazaraSlot(network::EnetConnection, OnKeepAlive, m_Slot);
+};
+
+}  // namespace client
+}  // namespace blitz