MQTT: add JSON payload corresponding to IEC Structured types

- uses https://github.com/cesanta/frozen
- frozen.c is added as a resulting c file in generat_C (fix toolchain_gcc.py as it was breaking dependency checking)
- structured types are converted to C #define, in turn generating json_scanf and json_printf statements

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#!/bin/bash

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CONTAINER=beremiz_sikuli_current

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docker start $CONTAINER

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docker exec -i -t -u root $CONTAINER bash

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docker stop $CONTAINER