* move forward_at_cmd_resp into InfosG3P class
- the variable is shared between the two connections
of an inverter. One is for the TSUN cloud and the
other for the device.
* use inverter class to share values between
the two protocol instances of a proxy
- move forward_at_cmd_resp into class InverterG3P
- store inverter ptr in Solarman_V5 instances
- add inverter ptr to all constructurs of protocols
- adapt doku and unit tests-
- add integration tests for AT+ commands which
check the forwarding from and to the TSUN cloud
* adapt and improve the unit tests
- fix node_id declaration, which always has a / at
the end. See config grammar for this rule
- set global var test to default after test run
* set equipment model dor DCU1000 devices
* DCU1000: add temp sensor and mppt states
* DCU1000: add total generation
* add more DCU1000 registers for MODBUS polling
* improve names of batterie measurements
* add more diagnostic registers
* adapt unit tests
* move uml files into subfolder
* add sensors for batterie cell voltages
* swap On and Off for MPPT status
