[UTL-46] Add MutableUniqueIdentifiable
[UTL-46] Add MutableUniqueIdentifiable

Add interface. Implement it on position/security classes

nssales/OG-Platform,ChinaQuants/OG-Platform,ChinaQuants/OG-Platform,nssales/OG-Platform,codeaudit/OG-Platform,McLeodMoores/starling,jeorme/OG-Platform,jeorme/OG-Platform,ChinaQuants/OG-Platform,DevStreet/FinanceAnalytics,nssales/OG-Platform,nssales/OG-Platform,jeorme/OG-Platform,codeaudit/OG-Platform,jeorme/OG-Platform,codeaudit/OG-Platform,DevStreet/FinanceAnalytics,codeaudit/OG-Platform,ChinaQuants/OG-Platform,McLeodMoores/starling,jerome79/OG-Platform,McLeodMoores/starling,jerome79/OG-Platform,DevStreet/FinanceAnalytics,McLeodMoores/starling,jerome79/OG-Platform,jerome79/OG-Platform,DevStreet/FinanceAnalytics