Add transitionFromFrame

[aleksanb]

I used this a lot during crank, as i keep forgetting the manual implementation of a transition at a certain frame. I guess i could replace the lerp with a clamp.

The name i used for this function in crank was
'interpolateFrame',

Usage:

    const letterGroup1ZPosition = easeIn(
      smoothstep(
        -100,
        0,
        interpolateFrame(frame, fadeDuration, 2489 - fadeDuration)
      ),
      fadeDuration,
      tFadeOut
    );

    const letterGroup2ZPosition = easeIn(
      smoothstep(
        -100,
        0,
        interpolateFrame(frame, fadeDuration, 2524 - fadeDuration)
      ),
      fadeDuration,
      tFadeOut
    );
    const letterGroup3ZPosition = easeIn(
      smoothstep(
        -100,
        0,
        interpolateFrame(frame, fadeDuration, 2560 - fadeDuration)
      ),
      fadeDuration,
      tFadeOut
    );