Add `BONUS_POINT_RATE` to `KeyPengaturan`.
Add `poin` (for bonus point) to `Produk`.
Add `poinTerkumpul` (for accumulated bonus points) to `Konsumen`.
Increase bonus points for customers when they've received their goods.
Add `potongPiutang()` to `Konsumen`.
Fixes Events to DefaultEventTableModel must arrive on the EDT
Fixes customer bonus points is not updated.
Add domain models for `PencairanPoin` (to represent bonus points redemption).