add/fix readme.

return to use _BitScanReverse to compute lzcnt.

(Because some Intel processors don't support bsr operation.)

account for difference with sampling rate in player.

fix crush bug for small signal segment.

delete trailing whitespace.

update result.

Revert "Revert "avoid quantize error variance. （幾何分布のエントロピー基準では、却って悪化）""

This reverts commit 0c272ca.

change default preset.

fix decoder bug in large coefficient order.

update results.