Form label / label hint doesn't work on widget

[vusters]

All widgets have a label / labelHint which can be used as the Form item's label and hint (if it is inside a Form). But the widget doesn't need to be inside form so setting label / labelHint should work. It used to work in the past but no long does.

• Please investigate and make them work.
• We should rename it to formLabel and formLabelHint? since it conflicts with widgets like Button's label.