SVGHMI: add support for multiline widget declaration using svg:desc.

Declaration started in inkscape:label and interupted by a '\' can be continued in the description field.
After an empty line, the rest of the description field is left for description text.

     1

#!/usr/bin/env python

     2

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

     3

     4

# This file is part of Beremiz

     5

# Copyright (C) 2019: Edouard TISSERANT

     6

#

     7

# See COPYING file for copyrights details.

     8

     9

from __future__ import absolute_import

    10

from svghmi.svghmi import *