- Modified RIL interface notifyExChangeAPDUResponse from uint8arry to DOMString
- Nit fixes
- Fixed CloseAllSessions usecase
- Started adding Error propogation logic
- _doIccExchangeAPDU internal func takes empty string vs previously empty array []
- Ready for first review / feedback!

Change-Id: I699c3948b84f468e0ca0a0df526135676c1d51cc