Changes of version 27.3.0

Make the tailed variants of i and l use the fully-tailed shape even when upright, as is consistent with t = bent-hook (#1692).
- The old, slightly-curly variants for i, l, iota (ι) and tau (τ) are moved to semi-tailed variants.
- Corresponded SSes are changed to keep the shape identical to the old version.
Make Cyrillic Yat to follow Yeri variants. Italic Yat will also respond to variants of n (#2047).
Add short-tailed lowercase tau (τ) (#2050).
Fix tailed variants for U+02A0.
Stylistic set fixes:
- Fix cv44 and cv99 for ss13.
- Fix cv48 and cv54 for ss17.
- Fix cv51 for Etoile.
- Fix cv52 for ss15 and Etoile.
- Fix cv58 for ss15.
- Fix cv59 for ss07.
- Fix cv61 for ss15 and ss17.
- Fix cv66 for ss01, ss06, and ss15.
- Fix vsAF for ss11.
- Fix vsAL for ss09 and ss18.

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