Prevent units from unloading over bay door limits

[SJuliez]

Fixes #5793

• Now respects bay door limits by filtering correctly (removed the nonsensical assignment in MovementDisplay)
• Removes a method in Entity that was used nowhere and some minor code/comment cleanups

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.06%. Comparing base (f7b39ab) to head (5074792).
Report is 22 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #5808      +/-   ##
============================================
- Coverage     29.06%   29.06%   -0.01%     
- Complexity    13907    13911       +4     
============================================
  Files          2507     2507              
  Lines        266333   266326       -7     
  Branches      47605    47602       -3     
============================================
- Hits          77421    77400      -21     
- Misses       184987   185004      +17     
+ Partials       3925     3922       -3     

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