Add charitable deductions as a skyline chart option

[MaxGhenis]

This would be cool given the charitable deduction reforms this year and charitable deductions being something people can directly control.

I mimicked it by selecting real estate tax paid and adjusting the policy parameters to match the charitable deduction policy (remove SALT cap, change AGI % cap for SALT to 60%).
https://www.compute.studio/PSLmodels/Tax-Cruncher/409/

[Peter-Metz]

Hey @MaxGhenis, thanks for the suggestion and for sharing your sim!

It's poorly named, but the "Mortgage" option in that dropdown comprises charitable contributions and other itemizable expenses that are not subject to the SALT. I'll clean that up in the documentation/labels.

As for implementing the recent reforms, that's something for the Tax-Calc community (including myself) to discuss on the developers call tomorrow.

[MaxGhenis]

Oh thanks, that's easier. Still not quite the same since e.g. charitable deductions are capped at 60% of AGI, but I think it'll do for what I need.