struct implementing interface is boxed when passed to method that accepts interface (not generic method).
Removes IDexLevel (no other inheritors but EvoCriteria) and uses the primitive the data is stored (array, not IReadOnlyList) for slightly better perf.
Change the data structure so that different locations are tied to the table, rather than separate usages of the table.
This de-bloats from 344KB->85KB and has less runtime memory consumption.
