Allow decimals in tax calculations

[biilmann]

We're running into a case where France has a 5.5% tax, and currently all tax settings are read and processed as integers.

We should update the calculator to allow reading taxes with decimals and adjust all calculations accordingly.

[bcomnes]

From slack via @mraerino

We haven't started on that, since I have been held up by other projects. Though recent refactors of the calculation made this easy to implement

[mheffner]

Is this still a high priority issue?

[mraerino]

nope. it's still asked for by some people, but we decided to not spend time on it right now. anyone from outside the org is obviously welcome to contribute.

[Crushla]

Hello, has this bug been fixed？

[mraerino]

this has not been fixed. any contributions are welcome.

[alecgarza96]

Is this still an issue?