New 'withholding' budget category type

[upstreammuse]

If using split transactions to track gross pay, paycheck deductions, and net pay, the user ends up having to create budget categories for the deductions. The least friction comes from creating routine expense categories for the deductions, but this causes the routine expense calculation to be higher than it should be. After all, if a paycheck stops, so do the income taxes. Proposing a new 'withholding' category that auto-funds itself like a routine expense, but that doesn't try to save for the future. Basically, this an expense that keeps itself at 0 available, much like an analog to income categories.

[upstreammuse]

Budget table should still show withholding categories, and maybe a summary of the total amount spent on each one?

[upstreammuse]

Budget table should still show withholding categories, and maybe a summary of the total amount spent on each one?

18 covers this case, so this should be closed.