Change mentions of PersonCard to ItemCard - DG Ui

[jianyangg]

as per Gambe's code name change update.

Need help checking if ItemCard has reference to Model.
Checking the code, I see no references to Model in ItemCard.java.
The access to Model in our code is done through Logic, so our
Ui class diagram may not be consistent with other groups'.

Close #487

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (497b56b) 83.97% compared to head (d04e162) 83.97%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #488   +/-   ##
=========================================
  Coverage     83.97%   83.97%           
  Complexity      977      977           
=========================================
  Files           121      121           
  Lines          2895     2895           
  Branches        342      342           
=========================================
  Hits           2431     2431           
  Misses          397      397           
  Partials         67       67           

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[juliusgambe]

LGTM. I don't think it is referenced in Model or ModelManager. Only ListItem which is our data structure to represent items in an ItemCard. Thanks for helping to change the name.