beremiz

SVGHMI: min and max limit for widgets can be set with assigned variables

This is a valid Widget declaration using new feature:
HMI:Input@/TARGETPRESSURE,0,max_pressure@max_pressure=hmi_local_max_setting

tests/projects/svghmi is updated accordingly.
PLC variables and local variables
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PLC variables start with ``/``
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Local Page variables start with ``.``
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Local HMI variables
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