v0.5.0

Animation

• Redesign the animation system - Animator (#243)
• Add animation event in Script(#372)
• Add BlendShape animation for ModelMesh (#374)

Rendering

• Redesign PBR material interface (#418)
• Support spherical harmonics for AmbientLight(#392)
• Add texture mode for Background (#427)
• Support vertex color for Blinnphone (#450)

Physics

• Add trigger methods into Script and rewrite CollisionDetection(#404)
• Add PhysicsManager and move raycast() from Scene to PhysicsManager(#462)

Math

• Add some commonly used methods for Color(#385)

2D

• Support SpriteAtlas #197 (#402)