* feat(time): add optional time format
* feat(time): show 12 hour time in stage timer
* feat(time): override locally
* feat(time): show timer in selected format
* feat(time): show 12 hour time in table header
* refactor: extract time formatting into utility
* refactor: migrate datetime library
* refactor(formatTime): centralise time formatting for viewers
* feature(12hour): version bump