Start making value and mutable korma APIs + join basic extension methods into korma classes

[soywiz]

This should allow going ahead with the release, while preparing for MFVC when they are ready.

Some work on #1257

We will need to be sure that APIs that return mutable types are renamed and hopefully marked as such. ie. fun View.getWindowBounds should be renamed to fun View.getMWindowBounds to be prepared

[codecov-commenter]

Codecov Report

Base: 51.97% // Head: 51.93% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (129ed84) compared to base (8ccccf8).
Patch coverage: 57.89% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1340      +/-   ##
==========================================
- Coverage   51.97%   51.93%   -0.05%     
==========================================
  Files        1687     1687              
  Lines      103935   103940       +5     
  Branches    15323    15324       +1     
==========================================
- Hits        54023    53982      -41     
- Misses      45636    45674      +38     
- Partials     4276     4284       +8     

Flag	Coverage Δ
unittests	51.93% <57.89%> (-0.05%)	⬇️

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

Impacted Files	Coverage Δ
.../src/commonMain/kotlin/samples/MainTrimmedAtlas.kt	0.00% <0.00%> (ø)
...c/commonMain/kotlin/com/soywiz/korge/ui/UIImage.kt	0.00% <0.00%> (ø)
.../commonMain/kotlin/com/soywiz/korge/ui/UIWindow.kt	0.00% <0.00%> (ø)
.../commonMain/kotlin/com/soywiz/korge/view/Camera.kt	0.00% <0.00%> (ø)
...Main/kotlin/com/soywiz/korge/view/camera/Camera.kt	0.00% <0.00%> (ø)
...n/kotlin/com/soywiz/korge/view/camera/CameraOld.kt	0.00% <0.00%> (ø)
...mmonMain/kotlin/com/soywiz/korge/view/grid/Grid.kt	8.33% <0.00%> (ø)
...Main/kotlin/com/soywiz/korge/view/tiles/TileMap.kt	65.23% <0.00%> (ø)
...otlin/com/soywiz/korge/view/vector/GpuShapeView.kt	17.33% <ø> (ø)
...orge/src/jvmMain/kotlin/com/soywiz/korge/awt/UI.kt	0.00% <0.00%> (ø)
... and 65 more

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