add attendance importer script

originally for gscs
revamp add_student_ids for gscs

changes:

- check that student names are unique in db before matching on them.
- take Full Name OR First/Last
- add ignore_case option to make case insensitive name matches.
- warn when some students in the file weren’t matched
change importInquiries to also import applicants

now can import inquiries OR applicants
add Success Only response type

for API responses like `{‘success’: true}`
add support for sets in format_for_log data
add ability to POST attendance data

originally for gscs attendance import