Changes of version 26.0.0

• [Breaking] Add asymmetric variant to all t styles (#1836).
• [Breaking] Add separate variant selector for lowercase Thorn (#1854).
• [Breaking] Drop tailed-top-left-serifed variant of n as it duplicates with tailed-motion-serifed (#1859).
• [Breaking] Disunified the variant selector for Greek Delta and Greek Lambda, and added selectable serif variants for Lambda (#1866).
• [Breaking] Add serif variant selection for Eszet (#1881).
• [Breaking] Add a separate variant selector for lowercase Greek Chi.
• Add Characters:
  • COMBINING DOUBLED CIRCUMFLEX ACCENT (U+1AB0) (#1879).
  • COMBINING DOUBLE PLUS SIGN ABOVE (U+1AC9) (#1879).
  • COMBINING DOUBLE PLUS SIGN BELOW (U+1ACA) (#1879).
  • ANTICLOCKWISE GAPPED CIRCLE ARROW (U+27F2).
  • CLOCKWISE GAPPED CIRCLE ARROW (U+27F3).
  • ANTICLOCKWISE CLOSED CIRCLE ARROW (U+2940).
  • CLOCKWISE CLOSED CIRCLE ARROW (U+2941).
  • LEFTWARDS TRIANGLE-HEADED ARROW (U+2B60) ... DOWNWARDS TRIANGLE-HEADED ARROW TO BAR (U+2B73).
  • LEFTWARDS TRIANGLE-HEADED ARROW WITH DOUBLE HORIZONTAL STROKE (U+2B7A) ... DOWNWARDS TRIANGLE-HEADED PAIRED ARROWS (U+2B87).
  • LATIN CAPITAL LETTER K WITH DIAGONAL STROKE (U+A742).
  • LATIN SMALL LETTER K WITH DIAGONAL STROKE (U+A743).
  • LATIN CAPITAL LETTER K WITH STROKE AND DIAGONAL STROKE (U+A744).
  • LATIN SMALL LETTER K WITH STROKE AND DIAGONAL STROKE (U+A745).
  • LATIN CAPITAL LETTER VOLAPUK AE (U+A79A) ... LATIN SMALL LETTER VOLAPUK UE (U+A79F) (#1865).
  • CIRCLED ANTICLOCKWISE ARROW (U+1F10E).
  • CIRCLED HUMAN FIGURE (U+1F16F).
• Drop <= and >= as inequality for Verilog (#1864).
• Support variant selection for INCREMENT and NABLA (#1873).
• Add APL-specific form for U+220A (#1876).
• Enable <> ligation as diamond for C-like (#1878).
• Fix support for serifs in Rounded Schwa (#1883).
• Add script-cut corner to U+0261 (#1887).
• Make Lowercase Schwa to respond to c's serif variants (#1892).
• Fix variant selection for cv27, cv33, cv36, and cv49 for ss17 under italics.
• Make Greek Kappa respond to top-left serifed variants of k.
• Fix slabs for U+019C, U+0257, U+026F, and U+0270.
• Add single-storey variants support for U+A657.