v1.2.0

• Fixed : Pixelaration shifts to the lower right.
• Fixed : Cutoff alpha is incorrect.
• Feature: Supports multiple shadow effect for reduce rendering vertices.
  
• Feature: New blur effect mode : Medium.
• Feature: Fix button to enable TexCoord1 of Canvas.additionalShaderChannels to use UIEffect.
  
• Changed : UIEffect.color is obsolete, use UIEffect.effectColor instead.
• Changed: Blur range is [0-2].
• Refactoring: Shader refactoring.
• Demo: Add transition button & multiple shadows.