Changed LogicFacadeDummy to use new ModelTask
Created TaskConverter skeleton
Added MarkDone command in OOP
Merge remote-tracking branch 'origin/jiashun'
Edit TaskList to ObservableList
Edit TaskList to use ObservableList instead of ArrayList.
Merge remote-tracking branch 'origin/krystal'
Added Undo command in OOP
edit
Edit Undo constructor.
Added Redo command in OOP
Fixed index.
Fixed index.
Added Add task at position
Fixed index
Added Move command in OOP
removed unnecessary catch statement
Removed ArrayList components