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

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/*

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 * Generated by erpcgen 1.13.0 on Fri Nov 22 15:03:08 2024.

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 *

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 * AUTOGENERATED - DO NOT EDIT

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 */

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#include "erpc_PLCObject_interface.hpp"

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#if 11300 != ERPC_VERSION_NUMBER

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#error "The generated shim code version is different to the rest of eRPC code."

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#endif

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using namespace std;

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using namespace erpcShim;

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BeremizPLCObjectService_interface::~BeremizPLCObjectService_interface(void)

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{

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}