Update to Cubism 5 SDK for Unity R5 beta1

[wada-at-live2d-com]

Added

• Add support for Blend mode and Offscreen drawing.
  • If the model uses blend mode or offscreen drawing, it will be rendered using a new drawing method that differs from Cubism 5.2 and earlier.
• Add high-precision mask method.
  • This is only available with the new rendering method in Cubism 5.3 and later, and masks in the new rendering method from Cubism 5.3 onward will automatically use this method.

Changed

• Change the version of the development project to 6000.0.55f1.
• Change _isOverriddenDrawableScreenColors and _isOverriddenDrawableMultiplyColors to _isOverriddenDrawObjectScreenColors and _isOverriddenDrawObjectMultiplyColors.
  • The property names that use these backing fields have also been updated accordingly.
  • Serialization of _isOverriddenDrawableScreenColors and _isOverriddenDrawableMultiplyColors is maintained by the FormerlySerializedAs attribute.

Removed

• Remove CubismCoreDll.GetDrawableRenderOrders and CubismUnmanagedDrawables.RenderOrders.
  • If you need to use these functions, please use CubismModel.AllDrawObjectsRenderOrder instead.
    • See CHANGELOG.md in Core.
• Remove Chrome OS from the tested environment.