py_ext: fix CSV Writer

fix POU logic :
- SAVE is a BOOL
- invocation of py_eval on rising edge of SAVE
- remove save python argument

fix python:
- use no encoding for file open (python2)
- re-use detected dialect if any
- use no "rt+" and truncate since no need to re-sniff dialect for output file
- return "OK" instead of "#SUCCESS", preventing POU logic to ACK result
- support creating new line if writing just after last line
- support appending data on short rows

fix example:
- use a HMI:Button to trigger CSV write instead of HMI:Input +1
- reload CSVs on on each new CSV opened in file browser
- add display of CSV write output

/*
 * Generated by erpcgen 1.13.0 on Fri Nov 22 15:03:08 2024.
 *
 * AUTOGENERATED - DO NOT EDIT
 */


#include "erpc_PLCObject_interface.hpp"

#if 11300 != ERPC_VERSION_NUMBER
#error "The generated shim code version is different to the rest of eRPC code."
#endif


using namespace std;
using namespace erpcShim;

BeremizPLCObjectService_interface::~BeremizPLCObjectService_interface(void)
{
}