stack_state_to_hex

//prints the op code being executed & the stack state BEFORE op code execution
#include "utilstrencodings.h"
#include "streams.h"
#include "script.h" 

cout << "Op being executed: " << GetOpName(opcode) << "\n";
for (unsigned int i = 0; i < stack.size(); i++) {
  for (unsigned int j = 0;  j < stack[i].size(); j++) {
    ss << stack[i][j];
 }
 ss << ' ';
 }
 printf("Stack: %s\n", HexStr(ss).c_str());