Acquire reference to moment as an argument instead of
assuming global availability; this appears to be no longer
be present globally after build changes
Initialize value for datetime control based on available
data, and keep up-to-date with changes from UI. Supports
clocks/timers, which use datetime as an entry field,
WTD-1221.
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 controller for dialog buttons sufficient to satisfy
spec; these will be used to launch dialogs to collect user input
for Image Properties et al to complete toolbar for Fixed Position
view, WTD-881.
Add a controller for composite controls; this is used
to flag contained controls as required when they have
been partially filled in (to treat entering one of two
such fields as invalid.) WTD-593.
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.
