Changed simulator to use new interfaces PacaTraca and PacaTracaFactory
provided by the instructor. Deleted old interface files. Refactored
ConsoleUIMain into 3 classes PacaTracaMain, PacaTracaSystemImpl, ConsoleUIMain.
Created PacaTraca objects for use throughout the system (in PacaTracaSystemImpl).
Switched everything to use this instead of AlpacaDataSimulator.