atrac3: reimplement tonal encoding. Use flatness-based tonal extractionnew_psy

- Add shared CalcSpectralFlatnessPerBfu helper in atrac_psy_common
  with BFU-table mapping.
- Implement ATRAC3 tonal extraction: compute MDCT energy, estimate
  per-BFU flatness, extract up to 5-bin strongest tonal run in
  low-flatness BFUs, and zero extracted bins in residual.
- Map extracted tonal bins into TTonalBlocks and integrate them into
  bitstream coding.
- Update ATRAC3 bit allocation - reduce residual bits for BFUs with tonal
  blocks, and increase tonal quantizer selection.
- Restore --notonal CLI option in main.cpp for A/B comparison.

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