Replace reference tests with screenshot tests and do some fixes and improvements

[soywiz]

No description provided.

[codecov-commenter]

Codecov Report

Base: 52.73% // Head: 51.93% // Decreases project coverage by -0.81% ⚠️

Coverage data is based on head (df64119) compared to base (ed46111).
Patch coverage: 21.19% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1320      +/-   ##
==========================================
- Coverage   52.73%   51.93%   -0.81%     
==========================================
  Files        1690     1690              
  Lines      103449   103537      +88     
  Branches    15301    15304       +3     
==========================================
- Hits        54555    53772     -783     
- Misses      44541    45465     +924     
+ Partials     4353     4300      -53     

Flag	Coverage Δ
unittests	51.93% <21.19%> (-0.81%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...otlin/com/soywiz/korlibs/root/RootKorlibsPlugin.kt	0.00% <0.00%> (ø)
...nTest/kotlin/com/soywiz/korge/KorgeHeadlessTest.kt	82.14% <ø> (-0.62%)	⬇️
.../kotlin/com/soywiz/korge/testing/BitmapAsserter.kt	0.00% <0.00%> (ø)
korgw/src/commonMain/kotlin/com/soywiz/korag/AG.kt	39.56% <0.00%> (-5.27%)	⬇️
...w/src/commonMain/kotlin/com/soywiz/korev/Events.kt	61.25% <0.00%> (-0.18%)	⬇️
...c/commonMain/kotlin/com/soywiz/korgw/GameWindow.kt	37.38% <0.00%> (+0.41%)	⬆️
...mMain/kotlin/com/soywiz/kgl/KmlGlContextDefault.kt	0.00% <0.00%> (ø)
...Main/kotlin/com/soywiz/korgw/osx/MacosGLContext.kt	0.00% <0.00%> (ø)
...ain/kotlin/com/soywiz/korgw/osx/MacosGameWindow.kt	0.00% <0.00%> (ø)
...monMain/kotlin/com/soywiz/korim/bitmap/Bitmap32.kt	55.58% <22.22%> (-3.47%)	⬇️
... and 94 more

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