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/uip_debug.cpp

@@ -0,0 +1,170 @@
+#include <Arduino.h>
+#include <HardwareSerial.h>
+#include <inttypes.h>
+#include <utility/uip_debug.h>
+extern "C" {
+  #import "utility/uip.h"
+}
+
+struct uip_conn con[UIP_CONNS];
+
+void
+UIPDebug::uip_debug_printconns()
+{
+  for(uint8_t i=0;i<UIP_CONNS;i++)
+    {
+      if (uip_debug_printcon(&con[i],&uip_conns[i]))
+        {
+          Serial.print("connection[");
+          Serial.print(i);
+          Serial.println("] changed.");
+        }
+    }
+}
+
+bool
+UIPDebug::uip_debug_printcon(struct uip_conn *lhs,struct uip_conn *rhs)
+{
+  bool changed = false;
+  if (!uip_ipaddr_cmp(lhs->ripaddr,rhs->ripaddr))
+    {
+      Serial.print(" ripaddr: ");
+      uip_debug_printbytes((const uint8_t *)lhs->ripaddr,4);
+      Serial.print(" -> ");
+      uip_debug_printbytes((const uint8_t *)rhs->ripaddr,4);
+      Serial.println();
+      uip_ipaddr_copy(lhs->ripaddr,rhs->ripaddr);
+      changed = true;
+    }
+  if (lhs->lport != rhs->lport)
+    {
+      Serial.print(" lport: ");
+      Serial.print(htons(lhs->lport));
+      Serial.print(" -> ");
+      Serial.println(htons(rhs->lport));
+      lhs->lport = rhs->lport;
+      changed = true;
+    }
+  if (lhs->rport != rhs->rport)
+    {
+      Serial.print(" rport: ");
+      Serial.print(htons(lhs->rport));
+      Serial.print(" -> ");
+      Serial.println(htons(rhs->rport));
+      lhs->rport = rhs->rport;
+      changed = true;
+    }
+  if ((uint32_t)lhs->rcv_nxt[0] != (uint32_t)rhs->rcv_nxt[0])
+    {
+      Serial.print(" rcv_nxt: ");
+      uip_debug_printbytes(lhs->rcv_nxt,4);
+      Serial.print(" -> ");
+      uip_debug_printbytes(rhs->rcv_nxt,4);
+      *((uint32_t *)&lhs->rcv_nxt[0]) = (uint32_t)rhs->rcv_nxt[0];
+      Serial.println();
+      changed = true;
+    }
+  if ((uint32_t)lhs->snd_nxt[0] != (uint32_t)rhs->snd_nxt[0])
+    {
+      Serial.print(" snd_nxt: ");
+      uip_debug_printbytes(lhs->snd_nxt,4);
+      Serial.print(" -> ");
+      uip_debug_printbytes(rhs->snd_nxt,4);
+      *((uint32_t *)&lhs->snd_nxt[0]) = (uint32_t)rhs->snd_nxt[0];
+      Serial.println();
+      changed = true;
+    }
+  if (lhs->len != rhs->len)
+    {
+      Serial.print(" len: ");
+      Serial.print(lhs->len);
+      Serial.print(" -> ");
+      Serial.println(rhs->len);
+      lhs->len = rhs->len;
+      changed = true;
+    }
+  if (lhs->mss != rhs->mss)
+    {
+      Serial.print(" mss: ");
+      Serial.print(lhs->mss);
+      Serial.print(" -> ");
+      Serial.println(rhs->mss);
+      lhs->mss = rhs->mss;
+      changed = true;
+    }
+  if (lhs->initialmss != rhs->initialmss)
+    {
+      Serial.print(" initialmss: ");
+      Serial.print(lhs->initialmss);
+      Serial.print(" -> ");
+      Serial.println(rhs->initialmss);
+      lhs->initialmss = rhs->initialmss;
+      changed = true;
+    }
+  if (lhs->sa != rhs->sa)
+    {
+      Serial.print(" sa: ");
+      Serial.print(lhs->sa);
+      Serial.print(" -> ");
+      Serial.println(rhs->sa);
+      lhs->sa = rhs->sa;
+      changed = true;
+    }
+  if (lhs->sv != rhs->sv)
+    {
+      Serial.print(" sv: ");
+      Serial.print(lhs->sv);
+      Serial.print(" -> ");
+      Serial.println(rhs->sv);
+      lhs->sv = rhs->sv;
+      changed = true;
+    }
+  if (lhs->rto != rhs->rto)
+    {
+      Serial.print(" rto: ");
+      Serial.print(lhs->rto);
+      Serial.print(" -> ");
+      Serial.println(rhs->rto);
+      lhs->rto = rhs->rto;
+      changed = true;
+    }
+  if (lhs->tcpstateflags != rhs->tcpstateflags)
+    {
+      Serial.print(" tcpstateflags: ");
+      Serial.print(lhs->tcpstateflags);
+      Serial.print(" -> ");
+      Serial.println(rhs->tcpstateflags);
+      lhs->tcpstateflags = rhs->tcpstateflags;
+      changed = true;
+    }
+  if (lhs->timer != rhs->timer)
+    {
+      Serial.print(" timer: ");
+      Serial.print(lhs->timer);
+      Serial.print(" -> ");
+      Serial.println(rhs->timer);
+      lhs->timer = rhs->timer;
+      changed = true;
+    }
+  if (lhs->nrtx != rhs->nrtx)
+    {
+      Serial.print(" nrtx: ");
+      Serial.print(lhs->nrtx);
+      Serial.print(" -> ");
+      Serial.println(rhs->nrtx);
+      lhs->nrtx = rhs->nrtx;
+      changed = true;
+    }
+  return changed;
+}
+
+void
+UIPDebug::uip_debug_printbytes(const uint8_t *data, uint8_t len)
+{
+  for(uint8_t i=0;i<len;i++)
+    {
+      Serial.print(data[i]);
+      if (i<len-1)
+        Serial.print(",");
+    }
+}