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- Create a new SField metadata enum, sMD_NeedsAsset, which indicates the field should be associated with an Asset so it can be rounded. - Add a new STTakesAsset intermediate class to handle the Asset association to a derived ST class. Currently only used in STNumber, but could be used by other types in the future. - Add "associateAsset" which takes an SLE and an Asset, finds the sMD_NeedsAsset fields, and associates the Asset to them. In the case of STNumber, that both stores the Asset, and rounds the value immediately. - Transactors only need to add a call to associateAsset _after_ all of the STNumbers have been set. Unfortunately, the inner workings of STObject do not do the association correctly with uninitialized fields. - When serializing an STNumber that has an Asset, round it before serializing. - Add an override of roundToAsset, which rounds a Number value in place to an Asset, but without any additional scale. - Update and fix a bunch of Loan-related tests to accommodate the expanded Number class. - (Not all tests are fixed yet.)