Update to Cubism 5 SDK for Web R2

[wada-at-live2d-com]

Added

• Add the functionality to call a function when motion playback starts.
• Add an API to CubismMotionJson for verifying the consistency of motion3.json. by @pillowtrucker
  • This API is ported from Cubism Native Framework.

Changed

• Change to create and manage a CubismShader for each GLRenderingContext.
• Change the access level of the private members in CubismModelSettingJson class to protected.
• Move JSON key strings set to the member variables of CubismModelSettingJson class.
• Change FrequestNode to be exported as part of the module.
• Change to permit to overwrite motion fade by the value specified in .model3.json on CubismUserModel.loadMotion().
• Change the value of pi used in the calculation of CubismBreath.updateParameters() to Math.PI.

Deprecated

• Deprecate the following elements because a priority value is not actually used during expression motion playback:

  • CubismExpressionMotionManager._currentPriority
  • CubismExpressionMotionManager._reservePriority
  • CubismExpressionMotionManager.startMotionPriority()
  • CubismExpressionMotionManager.getCurrentPriority()
  • CubismExpressionMotionManager.getReservePriority()
  • CubismExpressionMotionManager.setReservePriority()

  Please use the CubismMotionQueueManager.startMotion() instead of CubismExpressionMotionManager.startMotionPriority().

Fixed

• Fix an issue where already registered keys could be added on csmMap.appendKey().
• Fix a bug that caused an error when playing CubismExpresionMotion with CubismMotionQueueManager.startMotion().
• Fix an issue where CubismMath.cardanoAlgorithmForBezier() was using a different function than Cubism SDK for Native.
• Fix a potential problem with division by 0 when a pose fade time is set to 0 seconds.
• Fix an issue where CubismPose._fadeTimeSeconds does not become 0.