Implement secondary list retrieval for dropdown options

[BlakeDraper]

Many issues being reported of dropdown options lists not loading, causing much frustration among users. The weak point is the single request on page load /component instantiation for the list data. User interaction with the dropdown needs to trigger a check for needed data and create new request where it does not exist.

This needs to happen application-wide for all forms. Consider a utility function for this.

Reference issues:

#1183, #1184