beremiz

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
IEC-61131 PLC programming
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Contents:
.. toctree::
:maxdepth: 2
create
configuration
edit
connect
run
stdlib/index