Add "feature" to tile card: Convert Hours

[ChristophCaina]

within HomeAssistant, you can get Sensor Values that report durations.
The Duration can use different units_of_measurements.

The entities card does show the value in hours, while the entity card does convert the value into days.

With the new tile card, it would be great to have the option to select a feature where the value could be converted (hours, days, weeks, etc.)