* add polling invertval and method ha_remove()
* add client_mode arg to constructors
- add PollingInvervall
* hide some topics in client mode
- we hide topics in HA by sending an empty register
MQTT topic during HA auto configuration
* add client_mode value
* update class diagram
* fix modbus close handler
- fix empty call and cleanup que
- add unit test
* don't sent an initial 1710 msg in client mode
* change HA icon for inverter status
* increase test coverage
* accelerate timer tests
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