Use two decimals for delayed scale factor #114
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This is cleaner in code and it also makes it possible to provide a configurable percentage
This rebalances the bits to be more useful for anticipated values. A uint16 proves 65536 possible possibilities, but using basis points means that the values range from 0-6 with 4 decimals. As a percentage, this can represent up to 655 with two decimals.
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This PR make two changes.
Firstly, move the percentage calculations to a separate library. This is cleaner in code and it also makes it easier to use different precision amounts.
The second is to use two decimals of precision for the delayed fee percentage. As a uint16 there are 65536 possible values but in basis points we can only represent numbers between 0 and 6.5 (albeit with very high precision). With two decimals we can represent numbers up to 655 (with less precision).