- Is backward compatible to all rules without `TransferAccount` added.
* `TransferAccount` value must be added via custom rules.
- Every `DEPOSIT` entry must have a corresponding `WITHDRAWAL` entry
(and vice versa).
- Adds new income/spends keymap files dedicated to `TransferAccount`
* Kept separate from respective `Account` keymap files.
- Upstream appears to support `TransferAccount` in all years even though
it was introduced specifically for tax years 2025+ (mileage may vary).