v3.5.5

This release incorporates improvements and bug fixes collected from President's Cup IV Round 1. Updates include:

• Limiting permissions for Support role in the Admin area
• Adding new fields to participation reports as well as improving the accuracy of other stats
• Support shift windows are now configurable via an API deployment setting.
• Certificates only appear for competitors who started a session on a given board.

Matching UI release:
https://github.com/cmu-sei/gameboard-ui/releases/tag/3.5.5

What's Changed

• Miscellaneous admin and support improvements by @sei-jperrino in #53
• Certificate and board report bugfixes by @sei-jperrino in #54

Full Changelog: 3.5.4...3.5.5