Improve the settings code via inspector

[bakulf]

It turned out that we can cleanup the inspector + settings a lot using QT meta object.

[codecov-commenter]

Codecov Report

Base: 38.41% // Head: 38.41% // No change to project coverage 👍

Coverage data is based on head (24207f3) compared to base (24207f3).
Patch has no changes to coverable lines.

❗ Current head 24207f3 differs from pull request most recent head f96761d. Consider uploading reports for the commit f96761d to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5064   +/-   ##
=======================================
  Coverage   38.41%   38.41%           
=======================================
  Files         330      330           
  Lines       22145    22145           
  Branches    11966    11966           
=======================================
  Hits         8508     8508           
  Misses       5802     5802           
  Partials     7835     7835           

Flag	Coverage Δ
functional_tests	27.74% <0.00%> (ø)
lottie_tests	23.06% <0.00%> (ø)
unit_tests	33.96% <0.00%> (ø)

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