Allow to set icons, friendly names and UoM in config

[abinitio1980]

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Have achieved via customisations.yaml, but every time the sensors update, they revert to the defaults

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Ability to set icons, friendly names and units of measurements in the config

e.g.
run_devices:

• energy_time: 2.5
  entity_id: dishwasher
  run_before: '08:00:00'
  run_time: 2.5
  friendly_name: 'Start Dishwasher in'
  unit_of_measurement: 'hours'
  icon: mdi:dishwasher

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have tried via customisations functionality, but although the customisations are applied (and saved) they disappear when the devices are updated

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