feat: Add Redo

[yeppog]

Allows for Redo-ing a command that has been undone

• Changes the implementation for CommandHistory to be a custom doubly linked list to allow for pointer storage.
• Stack now persists even after undo-ing to allow for redo-ing
• Stack purges the head of the linked list after exceeding the maximum stack size, which can be defined in the constructor.
• Redo simply re executes() the stored Command on the stack

Intended behaviour

• When undoing commands, if a new command is executed, the history points of Commands executed after the current undo point will be lost. For example:

Stack:
null <-> add 1 <-> add 2 <-> add 3 <-> null
                                        ^current
Stack after undoing twice:
null <-> add 1 <-> add 2 <-> add 3 <-> null
                    ^current

Stack after adding a new command:
null <-> add 1 <-> add 7 <-> null
                               ^current

• Current will always point to null to signify that it is at the top of the stack

[codecov-commenter]

Codecov Report

Merging #100 (b317bf3) into master (223e831) will increase coverage by 0.01%.
The diff coverage is 51.42%.

@@             Coverage Diff              @@
##             master     #100      +/-   ##
============================================
+ Coverage     58.40%   58.41%   +0.01%     
- Complexity      591      599       +8     
============================================
  Files           120      121       +1     
  Lines          2505     2561      +56     
  Branches        240      251      +11     
============================================
+ Hits           1463     1496      +33     
- Misses          953      975      +22     
- Partials         89       90       +1     

Impacted Files	Coverage Δ
...rc/main/java/seedu/address/logic/LogicManager.java	36.73% <0.00%> (-2.40%)	⬇️
...java/seedu/address/logic/commands/RedoCommand.java	0.00% <0.00%> (ø)
.../seedu/address/logic/parser/AddressBookParser.java	80.00% <0.00%> (-4.22%)	⬇️
src/main/java/seedu/address/model/Model.java	100.00% <ø> (ø)
src/main/java/seedu/address/ui/MainWindow.java	0.00% <0.00%> (ø)
...java/seedu/address/logic/commands/UndoCommand.java	57.14% <33.33%> (ø)
src/main/java/seedu/address/model/TaskList.java	67.85% <33.33%> (-4.15%)	⬇️
...ain/java/seedu/address/storage/CommandHistory.java	70.00% <69.76%> (+20.00%)	⬆️
...du/address/logic/commands/task/AddTaskCommand.java	72.72% <100.00%> (+18.18%)	⬆️
...rc/main/java/seedu/address/model/ModelManager.java	81.92% <100.00%> (+0.31%)	⬆️
... and 1 more

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[jeffsieu]

LGTM