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

IDE: Fix wrong red wire coloring in FBD

C runtime: move generated erpc interface in separate "service" directory

IDE: Fix PLCOpenEditor (wxPython4 menus) and drop broken PDF doc support.

Extend HMI:JsonTable, create Edit CSV POU, create example, add some doc (#41)

* Extend Jsontable widget, create Edit CSV POU, create example for both

* Add doc for HMI:Image and HMI:JsonTable

* Expand example to include HMI:Image

Tests: matiec version bump for GH workflow

Merge remote-tracking branch 'hggit/python3' into python3

IDE: fix exception when moving FBD elements with keyboard.

Tests: matiec version bum for GH workflow

merge

Tests: extend FOR loop tests in IEC-61131 language test

Modbus: allows modbus thread stack size customization with MODBUS_STACK_SIZE macro.

For example, add "-DMODBUS_STACK_SIZE=0x2000" to target CFLAGS to limit stack size to 128kB

SVGHMI: swap position and range of ForEach widget so that both range and size can be optional.

Tests: add ST FOR loop tests to IEC-61131 language tests