Changes in SensorEntity

A lot of changes have happened in SensorEntity in the last six months. We should update our sensor and apply the changes.

New properties (native_value, native_unit_of_measurement)
Remove properties (state, unit_of_measurement)
there are new available device classes
We are using only state_class measurement. There are new total and total_increasing.

martindybal / taphome-homeassistant