Do not send removals for hidden entities

[Shatur]

• Added a simple check and a test that now passes (fails without the fix).
• Added a similar test for despawns.
• Use is_visible helper for despawns.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.20%. Comparing base (7e6c077) to head (04b619a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #370      +/-   ##
==========================================
+ Coverage   90.19%   90.20%   +0.01%     
==========================================
  Files          46       46              
  Lines        2559     2562       +3     
==========================================
+ Hits         2308     2311       +3     
  Misses        251      251              

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[UkoeHB]

Nice catch