Update to Cubism 5 SDK for Unity R5 beta3

[wada-at-live2d-com]

Added

• Add scripts and assets for using the Universal Render Pipeline and custom render passes to Assets/Live2D/Cubism/Rendering/URP.
• Add a feature to allow rendering of arbitrary objects before and after the rendering of model draw objects.
• Add CubismLookCenterTransform and CubismLookCenterArtMesh to allow setting the look-at center using either a Transform or an ArtMesh.

Changed

• Change to work based on the Universal Render Pipeline.
  • Built-in Render Pipeline and High Definition Render Pipeline are not supported.
    • Cubism 5 SDK for Unity R4_1 and its derivative packages will be maintained as Built-in Render Pipeline compatible versions.
      • Models and features from Cubism 5.3 and later cannot be used.
  • The use of custom render passes is required.

Fixed

• Fix an issue where ReleaseStaleRenderTextures() could release RenderTexture in use depending on the timing of its invocation.
• Fix an issue where the texture settings were not as intended when imported.
• Fix an issue where look-at tracking was misaligned when using CubismLookController.
• Fix an issue where the Koharu model's .model3.json was missing references to .motion3.json.
• Fix Koharu's corrupted .motion3.json files.
• Fix an issue where Raycast was functional even when CubismRaycastable was inactive.

Removed

• Remove unused shaders and materials.
• Remove Assets/Live2D/Cubism/Rendering/CubismCommonRenderFrameBuffer.cs and Assets/Live2D/Cubism/Rendering/ArrayExtensionMethods.cs.
• Remove Assets/Live2D/Cubism/Rendering/Resources/Live2D/Cubism/Prefabs/ModelCanvas.prefab.
• Remove scripts and related processes under Assets/Live2D/Cubism/Rendering/Masking and Assets/Live2D/Cubism/Samples/Masking.
  • Remove Assets/Live2D/Cubism/Editor/Inspectors/CubismMaskControllerInspector.cs, Assets/Live2D/Cubism/Editor/Inspectors/CubismMaskTextureInspector.cs, and Assets/Live2D/Cubism/Rendering/Resources/Live2D/Cubism/GlobalMaskTexture.asset accordingly.
  • Mask processing has been integrated into CubismRenderer.