lottie/slot: slottable properties coverage++

Any Lottie property can be a slot target
Some can be added mechanically without
touching the existing structure, so this adds
them in bulk for API convenience.

Newly slottable:
- LottieTransform: anchor
- LottiePolyStar: position, ptsCnt, rotation, innerRadius, innerRoundness,
  outerRadius, outerRoundness
- LottieRepeater: copies, offset, position, rotation, scale, anchor,
  startOpacity, endOpacity
- LottieRoundedCorner: radius
- LottieOffsetPath: offset, miterLimit
- LottiePuckerBloat: amount
- LottieZigZag: amplitude
- LottieTextRange: start, end, offset, maxAmount, smoothness, maxEase, minEase
- LottieText: alignOp.anchor