Improves UIVertical/HorizontalStack behaviour, to compute its size based on their childrens by default

[soywiz]

Fixes #1735

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and project coverage change: +0.01 🎉

Comparison is base (a0218b2) 51.13% compared to head (6d9cf85) 51.15%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1739      +/-   ##
==========================================
+ Coverage   51.13%   51.15%   +0.01%     
==========================================
  Files        1732     1734       +2     
  Lines      101692   101767      +75     
  Branches    14416    14430      +14     
==========================================
+ Hits        52003    52056      +53     
- Misses      45727    45751      +24     
+ Partials     3962     3960       -2     

Flag	Coverage Δ
unittests	51.15% <50.00%> (+0.01%)	⬆️

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Impacted Files	Coverage Δ
...dbox/src/commonMain/kotlin/samples/MainUIStacks.kt	0.00% <0.00%> (ø)
...Main/kotlin/korlibs/korge/ui/UIContainerLayouts.kt	41.08% <53.84%> (+13.40%)	⬆️
.../kotlin/korlibs/korge/ui/UIContainerLayoutsTest.kt	84.84% <84.84%> (ø)

... and 22 files with indirect coverage changes

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