tabulated input fields do not adapt to unit fraction

[hwjeremy]

Global and Custom units may have arbitrary minimum fractions. For example a U.S. Dollar's smallest fraction is cents (two fractional digits) while a Bitcoin might have a Satoshi as its smallest fraction (six fractional digits). While the Amatino API fully supports such arbitrary fractions, Amatino Mac is currently hard-coded with two fractional digits. For example, in TabularAmountInput:

init(
        frame frameRect: NSRect,
        side: Side
) {
        self.side = side
        super.init(frame: frameRect)
        numberFormatter.locale = Locale.current
        numberFormatter.numberStyle = .decimal
        numberFormatter.currencySymbol = nil
        numberFormatter.minimumIntegerDigits = 1
        numberFormatter.minimumFractionDigits = 2 // <- bad!
        numberFormatter.maximumFractionDigits = 2 // <- bad!

//...

To resolve this issue, various input classes will need to be able to receive and adapt to supplied Global and Custom unit fractional digit sizes.