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  8 11:06:24 2024.
#
# AUTOGENERATED - DO NOT EDIT
#

try:
    from erpc import erpc_version
    version = erpc_version.ERPC_VERSION
except ImportError:
    version = "unknown"
if version != "1.13.0":
    raise ValueError("The generated shim code version (1.13.0) is different to the rest of eRPC code (%s). \
Install newer version by running \"python setup.py install\" in folder erpc/erpc_python/." % repr(version))

from . import common
from . import client
from . import server
from . import interface