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
<xsd:element name="Generic">
<xsd:complexType>
%(toolchain_makefile)s
</xsd:complexType>
</xsd:element>