Adds an unresolved validation status to make it possible to clear
visible field validation errors, even if status is not yet valid.
Change-Id: I227a8802b6a71be1533dc903bad1a8e2faef5ed2
BinderStatusHandler is now triggered only once per validation.
Unified ValidationError and BinderResult into BinderValidationStatus.
Renamed ValidationStatusChangeEvent into ValidationStatus.
Unified handler names for validation status.
Next patch will fix resetting of field errors on reset.
Change-Id: I9536d554d781fe599fbd7e5bcb5a9ffebe675ca0