Release v0.8.5

new features:

• new event support: onMoving
• costumeConfig: support FaceLeft
• add sprite.SetDying, sprite.Die, sprite.Visible
• add sprite.ChangeXYpos

changes:

• bugfix: Turn(delta) means TurnLeft(delta)
• remove mutex from Game/Sprite (since we are using single thread model)
• loadSprite bugfix: init gamer pointer
• fix: sprite scale