[PLAT-2959] - Add CashFlowSecurity: remove wildcard imports
[PLAT-2959] - Add CashFlowSecurity: added in cashflow to web securities
[PLAT-2959] - Add CashFlowSecurity: added in cashflow to web securities
[PLAT-2959] - Add CashFlowSecurity: added in excel definitions for cash and cashflow
[PLAT-2959] - Split portfolio loader tool to allow testing of loader. Added tests for loading equities and cashflows
[PLAT-2959] - Tidied up formatting in test