[FEATURE]-Update obsolete attribute message on DisplayBase to be more descriptive

[ndorin]

Is your feature request related to a problem? Please describe. Currently, the PowerIsOnFeedback property on the DisplayBase class is decorated as indicated below. This needs to be updated to be more descriptive and include the suggested course of action.

[Obsolete("This property will be removed in version 2.0.0")]
public abstract BoolFeedback PowerIsOnFeedback { get; protected set; }

Describe the solution you'd like The Obsolete message should be updated to:

[Obsolete("This property will be removed in version 2.0.0.  Please use TwoWayDisplayBase instead if power feedback is required.")]