Add the new fields of data modal to all imports

Per story [61085714](https://www.pivotaltracker.com/story/show/61085714).  Can now import every field that appears in the modal form (for those cases where we allow imports). Other important changes:

- Refactored Sections/Clauses import templates into one.
- New Column handler for the Status/State field (which permitted small refactor of PBC Request import).
- Updated import template to show these new fields.