Add slot descriptions, matcher randomness #480
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Closes #466.
Matcher slots currently have no special metadata that coordinators can use to indicate special sections with---this information needs to be communicated to mentors separately. Adding a description to slots allows for this metadata to be embedded within the matcher, so mentors can see whether sections have any special tags (ex. NPE, affinity section, etc.) prior to filling availability.
Secondly, this PR also adds some randomness to the matcher algorithm, randomly shuffling the lists of mentors/slots/preferences so that tiebreaks happen approximately uniformly.