v0.5.0

• fix: HandMotionTracker recognises LL, Ñ and RR in 98 % of simulated takes, from 52-58 %, and no longer sees them
  where there are none (it did in 4-5 % of the takes): quick and short shifts (half a palm) and slow ones (up to 1.6 s),
  the frames without a letter while the hand moves no longer count against the base letter, Ñ also by turning the
  wrist (it follows the fingertips), the last swing of a shake is not a shift, changing letters while moving is not a
  letter with movement, and a long shake is a single Ñ
• feat: HandMotionTracker.update also takes the letters with their scores (estimate(hand).letters,
  classifier.predict(hand)): the base letter counts when it comes second but close
• change: a shift is recognised once the hand stops going that way (150 ms later); the defaults are now windowMs
  2000, minShift 0.5 and minSwing 0.12, and minBaseShare counts only the frames with a letter
• test: simulated takes of LL, Ñ and RR and of what is not one (pnpm evaluate:motion)