Don't force date-time inputs to act as if they are
required; allow them to be treated as optional, but
enforce that this only occurs when left completely
empty (as opposed to partially complete.)
Supports WTD-1221.
Implement date time controls up to the point that
they validate, and information (albeit not the right
information) propagates back up to the containing
form. WTD-530.
Add remaining platform form controls; amend mct-form
and mct-control directives to better communicate state.
Begin working on problem of communicating validation
back out of the form. WTD-530.
