Free Hero Mesh

    i+=2;
    p=data+i;
    while(i<size && data[i++]);
    if(i==size && data[i-1]) fatal("Malformed CLASS.DEF lump\n");
    if(messages[n]) fatal("Duplicate message number %d\n",n+256);
    messages[n]=strdup(p);
    if(!messages[n]) fatal("Allocation failed\n");
    if(n>=undef_message) undef_message=n+1;
  }
  free(data);
}

static void parse_order_block(void) {
  // OP_MISC1, OP_MISC1_C, etc = properties (_C=reverse)
  // 0x1000...0x10FF = Have flag