ac7a2601f2
This commit will allow an easier `FillModel` refactor: - Removing `ISecurityTransactionModel` and its implementations - Merging identicall tests from `EquityTransactionModelTests`, `ForexTransactionModelTests` and `SecurityTransactionModelTests` under `ImmediateFillModelTests`. This was possible because the mentioned `TransactionModels` implementations used `ImmediateFillModel`