Produce a Size-Class-based model selection widget based on the model inputs.
modelSelectionWidget(mods, modType)modelSelectionWidgetHeader(mods)
modelSelectionWidgetRow(mods, modType, sci)
Model Set Size object (from the reactive values list).
Model type, either "SE" or "CP".
Name of size class element
Rendered HTML model selection menu widget.
modelSelectionWidgetHeader creates header text depending on
if there is one size class or more than one.
modelSelectionWidgetRow creates a row of the widget (input
for one size class).