se-edu / addressbook-level4 / 4497

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Pull #861

travis-ci

DeveloperGuide: update section of UndoRedoStack to UndoRedoCareTaker

We previous have UndoRedoStack which stores the UndoableCommands in
LogicManager.

Since UndoRedoStack has been updated to UndoRedoCareTaker which
stores ReadOnlyAddressBook in a List, and has been moved to Model
layer instead, the sections on undo/redo feature, Logic and Model
component in DeveloperGuide is out of date.

Also, commands that do not mutate the address book, such as
FindCommand and ListCommand, will no longer clear the redoable
address book states. This allows us to redo to pass when we undo
commands and execute a non-mutating command afterwards.

Let's update the out of date sections which mention UndoRedoStack
in the DeveloperGuide to the updated UndoRedoCareTaker, and also
update on how the undo/redo mechanism works.

UndoableCommand has also been removed from the codebase.

Let's also remove the `Structure of Commands in the Logic Component`
section under Logic component, and any references to UndoableCommand
in DeveloperGuide.

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