Add Lot Number generators to the Registration page
@petespence reports that a meet director with the USAPL wants to be able to assign lot numbers randomly.
We should have a drop-down (multi-select) button at the top of the Registrations page that supports assigning Lot sequentially by order of registration (although this is pretty easy to do in spreadsheet software), and also completely randomly.
The best way to assign random numbers is to generate a shallow copy of the entries array, run the Fisher-Yates algorithm, and assign lot numbers sequentially from the shuffled array.
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It's also possible that we should just add an option to the Meet Setup page asking whether your federation uses lot numbers or not -- that would let us hide it for federations which do not, which would reduce some confusion (e.g., WRPF meet directors not understanding what a lot number is).