Add new scene controller with touch display example.

Upgraded RF24 to latest version which supports SoftSPI. 
Added DigitalIO and UTFT libraries to support the new example.
Fix problem reported in RelayWithButtonActuator example.

libraries/UIPEthernet/utility/mempool_conf.h

@@ -0,0 +1,34 @@
+#ifndef MEMPOOLCONF_H
+#define MEMPOOLCONF_H
+#include "uipethernet-conf.h"
+extern "C" {
+  #include "uipopt.h"
+  #include "enc28j60.h"
+}
+#include <inttypes.h>
+
+typedef uint16_t memaddress;
+typedef uint8_t memhandle;
+
+#if UIP_SOCKET_NUMPACKETS and UIP_CONNS
+#define NUM_TCP_MEMBLOCKS (UIP_SOCKET_NUMPACKETS*2)*UIP_CONNS
+#else
+#define NUM_TCP_MEMBLOCKS 0
+#endif
+
+#if UIP_UDP and UIP_UDP_CONNS
+#define NUM_UDP_MEMBLOCKS 3*UIP_UDP_CONNS
+#else
+#define NUM_UDP_MEMBLOCKS 0
+#endif
+
+#define MEMPOOL_NUM_MEMBLOCKS (NUM_TCP_MEMBLOCKS+NUM_UDP_MEMBLOCKS)
+
+#define MEMPOOL_STARTADDRESS TXSTART_INIT+1
+#define MEMPOOL_SIZE TXSTOP_INIT-TXSTART_INIT
+
+void enc28J60_mempool_block_move_callback(memaddress,memaddress,memaddress);
+
+#define MEMPOOL_MEMBLOCK_MV(dest,src,size) enc28J60_mempool_block_move_callback(dest,src,size)
+
+#endif