Don't panic on race condition in client info updating

[UkoeHB]

This line would panic erroneously due to a race condition between despawns and client acks: .expect("tick should be inserted on any component insertion");.

I moved the implementation details of ClientInfo inside its impl. One reason this bug occurred is the implementation logic was not self-contained so it was hard to reason about.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (5de3a92) 89.90% compared to head (4afbe1d) 89.94%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #173      +/-   ##
==========================================
+ Coverage   89.90%   89.94%   +0.03%     
==========================================
  Files          19       19              
  Lines        1209     1213       +4     
==========================================
+ Hits         1087     1091       +4     
  Misses        122      122              

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[Shatur]

Thanks, nice!

[Shatur]

Could you resolve conflicts with master?