Refactoring of Ui Package

[Mudaafi]

• [ ] Ensure that only MainWindow or a separate Class interacts with the Interpreter Layer
  • Presently, both HomeDisplay and CommandLineDisplay interacts with the Interpereter Layer
• [ ] Ensure that Ui Classes have no need to access Wallet, TaskList or any non-utils Classes
  • Presently, Wallet, TaskList, etc. are all Storage Layer Classes
  • There is also no Accessor Method/Class capable of extracting the required items w/o importing Wallet, TaskList and etc.