SVGHMI: intermediate commit while working on dropdown widget.

Here is the plan :
HMI:DropDown : svg:g of svg:rect + svg:text
rect is extended to match content size, and if content size exceed page size, user can scroll
HMI:List : either HMI:List:ListName as svg:text, one tspan per list entry
or HMI:List:ListName:Foreach:HMI_CLASS:SUB/PATH/TO/VALUE@/ROOT/PATH as empty svg:g

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#!/usr/bin/env python

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# -*- coding: utf-8 -*-

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# This file is part of Beremiz

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# Copyright (C) 2019: Edouard TISSERANT

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#

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# See COPYING file for copyrights details.

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from __future__ import absolute_import

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from svghmi.svghmi import *