Create/Define flow incrementally

[wrathagom]

As Luis was defining the flow parameters and parameter groups it occurred to me that static lists of options wasn't the most helpful. The most immediate solution I have is creating the flow incrementally.

Essentially each parameter group would have an index and they would have to be completed in order. it would also, optionally, have a flow all to itself. This miniature flow would get created once that parameter group was completed. This would allow step 1) to authenticate with a database and create an API endpoint for the UI to call in Step 2) to populate a field.

This is a necessary modification to enhance usability, but isn't necessary right away.