Moved logic for updating the 'other item' from TransactionItemViewModel to TransactionItemRollupViewModel, finished cleaning up unit tests after separating TransactionItemRollupViewModel
added reconciled to TransactionItemRollupViewModel
moved formattedPolarizedAmount from TransactionItemViewModel to TransactionItemRollupViewModel
moved toggleDetails from TransactionItemViewModel to TransactionItemRollupViewModel
moved formattedBalance from TransactionItemViewModel to TransactionItemRollupViewModel and added destroy method
correct id vs. id() usage
cleaned up transaction item view model code
cleaned up id vs. id() usage
added test for NewTransactionItemViewModel and made them pass