Refactoring

[boundtotheearth]

Create a generic UniqueItemList to replace UniqueDurationList and UniqueTrackedItemList
Refactor sort commands to work on the displayed list rather than the data inside the model
Fix Undo/Redo for find

[codecov-io]

Codecov Report

Merging #197 into master will decrease coverage by 0.11%.
The diff coverage is 70.46%.

@@             Coverage Diff              @@
##             master     #197      +/-   ##
============================================
- Coverage     60.08%   59.96%   -0.12%     
+ Complexity      841      825      -16     
============================================
  Files           144      143       -1     
  Lines          3179     3105      -74     
  Branches        365      350      -15     
============================================
- Hits           1910     1862      -48     
+ Misses         1127     1105      -22     
+ Partials        142      138       -4     

Impacted Files	Coverage Δ	Complexity Δ
...edu/momentum/logic/commands/DeleteTaskCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...seedu/momentum/logic/commands/EditTaskCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...du/momentum/logic/commands/ProjectViewCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...eedu/momentum/logic/commands/StartTaskCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...seedu/momentum/logic/commands/StopTaskCommand.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
src/main/java/seedu/momentum/model/Model.java	100.00% <ø> (ø)	1.00 <0.00> (ø)
...c/main/java/seedu/momentum/model/project/Task.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
.../java/seedu/momentum/model/timer/WorkDuration.java	80.00% <0.00%> (ø)	11.00 <0.00> (ø)
.../momentum/storage/JsonSerializableProjectBook.java	100.00% <ø> (ø)	5.00 <0.00> (ø)
src/main/java/seedu/momentum/ui/MainWindow.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
... and 27 more

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