* Delay security removal when there are pending settlements
* Add unit test
* Minor fixes
* Minor fix
* Replace HasUnsettledFunds method with UnsettledCash in ISettlementModel
* Minor fix
* Minor fix
* Address peer review
Replace ISettlementModel UnsettledCash property with GetUnsettledCash method that returns a CashAmount instead of a decimal to include the currency
* Minor fix
* Address peer review
Jhonathan Abreu