SVGHMI: In order to allow widget signature and description to coexist in same ysl2 file, introduced widget_class, widget_defs to declare widget codegen templates and gen_index_xhtml to mark templates that are only usefull in gen_index_xhtml.xslt.

Beremiz's user manual
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Contents:

.. toctree::
   :maxdepth: 2

   install
   start
   edit
   build
   connectors
   debug