Added support for radio checkboxes, visibility state and multi value children

Problem/Motivation

1. Module only works with select list widget.
2. Children multi value field is always rendered as a single select list.
3. No visibility states between dependencies.

Steps to reproduce

Proposed resolution

Fix JS file to support checkboxes / radios
Added visibility state on children fields based on parent selection.
Fix cardinality issue to allow multi value on children select lists.

Remaining tasks

User interface changes

API changes

Data model changes