keyframes_tween
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feat: add int lerp to the default lerp function
[why add this PR] : because I want to do the alpha animation, which is ranged from 0 to 255. I knew I can use opacity, which is ranged from 0.0 to 1.0. But a support of int lerp might help many other scenarios, such as rotation degree (which is from 0 to 360)