perf(tiledit): some more refactoring for performance

[NoxHarmonium]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 55.26316% with 17 lines in your changes missing coverage. Please review.

Project coverage is 65.47%. Comparing base (aa3456e) to head (f9c5cc0).

Files	Patch %	Lines
...irc-tiledit/libs/shared/src/mediancutquantizer.cpp	50.00%	0 Missing and 16 partials ⚠️
sirc-tiledit/libs/shared/include/utils.hpp	83.33%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #279      +/-   ##
==========================================
+ Coverage   65.40%   65.47%   +0.07%     
==========================================
  Files          65       65              
  Lines        6110     6108       -2     
  Branches     5924     5922       -2     
==========================================
+ Hits         3996     3999       +3     
+ Misses       1929     1926       -3     
+ Partials      185      183       -2     

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