Some Entity cleanup

[SJuliez]

Code updates for Entity in the hope of making it shorter and removing warnings

• removes almost all unused methods
• code updates like new switch statements and instaneof pattern variables, most of them one-click suggestions by the IDE
• other updates to remove warnings like incomplete javadoc

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.09%. Comparing base (07a8bb0) to head (96e1119).
Report is 16 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #6004      +/-   ##
============================================
+ Coverage     29.07%   29.09%   +0.02%     
+ Complexity    13958    13957       -1     
============================================
  Files          2576     2576              
  Lines        267398   267183     -215     
  Branches      47803    47718      -85     
============================================
+ Hits          77735    77737       +2     
+ Misses       185761   185541     -220     
- Partials       3902     3905       +3     

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