feat: map small-caps, tabular-oldstyle and misc non-standard glyph names

xpdf resolves glyph names through the nameToUnicode tables plus a fallback
for 'Axx'/'xx' hex-style names; it does not implement the AGL rule of
stripping the suffix after a period. Names like "a.sc" or "three.taboldstyle"
therefore resolve to nothing and the glyph is dropped from the output
entirely -- not substituted, simply lost.

Ported from the stale branch fix-non-standard-font-names, with two changes:

- sc.nameToUnicode was shipped there but never referenced from xpdfrc, so it
  would have been dead weight; both it and others.nameToUnicode are now
  registered.
- sc.nameToUnicode was missing k.sc (it ran a-j then l-z); added.

taboldstyle.nameToUnicode previously held only eight.taboldstyle; it now
covers 0-9.

Verified with minimal PDFs that reference these names via an /Encoding
/Differences array:

  a.sc b.sc k.sc z.sc               before: (no output)   after: a b k z
  three/seven/zero.taboldstyle      before: (no output)   after: 3 7 0
  lscript partialdiff arrowhookleft before: d             after: l d <hook>

Note that partialdiff is already in xpdf's built-in table, so that entry is
redundant; it is kept for explicitness.

Author: lfoppiano

languages/xpdf-others/others.nameToUnicode

@@ -0,0 +1,4 @@
+2113 lscript
+2202 partialdiff
+21A9 arrowhookleft
+21A9 arrowrighttophalf

languages/xpdf-others/sc.nameToUnicode

@@ -0,0 +1,27 @@
+0061 a.sc
+0062 b.sc
+0063 c.sc
+0064 d.sc
+0065 e.sc
+0066 f.sc
+0067 g.sc
+0068 h.sc
+0069 i.sc
+006a j.sc
+006b k.sc
+006c l.sc
+006d m.sc
+006e n.sc
+006f o.sc
+0070 p.sc
+0071 q.sc
+0072 r.sc
+0073 s.sc
+0074 t.sc
+0075 u.sc
+0076 v.sc
+0077 w.sc
+0078 x.sc
+0079 y.sc
+007a z.sc
+002d hyphen.sc

languages/xpdf-others/taboldstyle.nameToUnicode

@@ -1 +1,10 @@
-0038 eight.taboldstyle
+0030 zero.taboldstyle
+0031 one.taboldstyle
+0032 two.taboldstyle
+0033 three.taboldstyle
+0034 four.taboldstyle
+0035 five.taboldstyle
+0036 six.taboldstyle
+0037 seven.taboldstyle
+0038 eight.taboldstyle
+0039 nine.taboldstyle

xpdfrc

@@ -64,5 +64,7 @@ nameToUnicode	languages/xpdf-others/oldstyle.nameToUnicode
 nameToUnicode	languages/xpdf-others/taboldstyle.nameToUnicode
 nameToUnicode	languages/xpdf-others/ligatures.nameToUnicode
 nameToUnicode	languages/xpdf-others/fitted.nameToUnicode
+nameToUnicode	languages/xpdf-others/sc.nameToUnicode
+nameToUnicode	languages/xpdf-others/others.nameToUnicode
 unicodeRemapping	languages/xpdf-others/symbols.unicodeRemapping
 #----- end oldstyle support package