Create ToFractionString variant

[jordanrobot]

1. User can specify any denominator
2. rounds to nearest value
3. make an option to round up or down?
4. calculates instead of using a lookup.

Syntax:
[New]ToFraction(double value, int roundingAccuracy)

[PockyBum522]

I have code for this. Lemme see if I can find it easily.

[PockyBum522]

Check out:

https://github.com/PockyBum522/InventorShims/commit/a5b74126ec6e365dfc747440d5cd5e7e3f461f7d

[PockyBum522]

Note that the DecimalToFractions is untested. Test well if you implement