Fixes #2595 - Cli added

Based on projectkk2glider work, with a lot of bugs I am sure. Still not
tested, this is why I preferred working on my own branch. I push it now
so that Jenkins do the first tests and you can review if I am on the
right track. 

I am really wondering if a merge with the Lua api would be possible /
nice, what do you think?

radio/src/dump.cpp

@@ -0,0 +1,38 @@
+#include "opentx.h"
+
+#if defined(SIMU)
+#define dumpPrintf(...) debugPrintf(__VA_ARGS__)
+#else
+#define dumpPrintf(...) serialPrintf(__VA_ARGS__)
+#endif
+
+uint8_t dumpPosition;
+
+void dumpStart(unsigned int size)
+{
+  dumpPrintf("DUMP %d bytes ...\n\r", size);
+  dumpPosition = 0;
+}
+
+void dumpBody(const uint8_t *data, unsigned int size)
+{
+  for (unsigned int i=0; i<size; i++) {
+    dumpPrintf("%.2X ", data[i]);
+    dumpPosition++;
+    if ((dumpPosition & (32-1)) == 0) {
+      dumpPrintf("\r\n");
+    }
+  }
+}
+
+void dumpEnd()
+{
+  dumpPrintf("\r\n");
+}
+
+void dump(const uint8_t *data, unsigned int size)
+{
+  dumpStart(size);
+  dumpBody(data, size);
+  dumpEnd();
+}