Create Data Dictionaries

These changes add support creating data dictionaries from FCS files in
directories! I still need to add unit tests, but this change allows me
to get this app to SCRI so they can begin using it.

Main changes:
- Import apache poi to create Excel files.
- Created FCS file data fetchers which are used to fetch data from FCS
files for columns in the data dictionary.
- Use above to create data dictionary from successfully loaded FCS files