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Summary
SUMMARY: Bugfixes "Fix time duration formatting for periods in excess of 1 week"
Purpose of change
For time_durations in excess of 1 week, the formatting code would do the wrong thing. It tried to format two units worth of time (e.g. 1 week and 2 days) but the second unit could never be larger than hours.
Describe the solution
Add more cases to the code; now it can be anything up to seasons.
Describe alternatives you've considered
Arguably it would be better to say e.g. "1 hour and 0 minutes" than "1 hour and 3 seconds", but I don't want to change that now.
Testing
Added some unit tests.
Additional context
Discovered while working on achievements features.