Fix pstricks raw TeX interpretation for --includestyles mode (#2777)

* fix pstricks raw TeX interpretation for --includestyles mode

Enable raw pstricks loading alongside the ltxml binding so that
internal registers, utility macros, conditionals, and key-value
handlers from pstricks.tex/sty are available for downstream raw
packages (pst-3d.tex, pst-plot.tex, pstricks-add.tex, etc.).

Four fixes work together:

1. pstricks.tex.ltxml: load raw pstricks.tex via noltxml => 1
   instead of redirecting to the sty binding, so TeX-level
   internals (\pst@dima, \pstheader, \pst@number, etc.) are defined.

2. pstricks.sty.ltxml: load raw pstricks.sty before the ltxml
   overrides; add optional [] family argument to \psset (matching
   xkeyval's \setkeys+ interface); fix color key regex to avoid
   treating boolean values as colors and guard against undefined
   color lookups.

3. KeyVals.pm: filter empty strings from keyset lists produced by
   split(',', ...). The pstricks family list \pst@famlist
   accumulates as ",pstricks" (leading comma), so splitting
   produces ["", "pstricks"]. The empty keyset caused
   keyval_qname("psset","","ArrowInside") = "psset@@arrowinside",
   which collided with the raw \def\psset@@arrowinside (a delimited-
   argument helper), triggering "Missing argument" errors for
   delimiters -, \@empty, \@nil.

4. KeyVal.pm: fix empty macroprefix handling for boolean and
   command keys — use defined() checks so that an explicitly empty
   macroprefix="" is respected rather than falling through to the
   default qname-based macro name.

Resolves all 101 pstricks-related errors for arXiv paper 2405.20126v1.
Minimal reproduction: min-pstricks.tex (not committed).
Test suite: all 468 tests pass with no regressions.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* create pstricks_support layer and address feedback (thanks @brucemiller)

* only documented color keys with hex values use lowercase c

* add pstricks_support.sty.ltxml to MANIFEST

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: dginev

MANIFEST

@@ -697,6 +697,7 @@ lib/LaTeXML/Package/pst-grad.sty.ltxml
 lib/LaTeXML/Package/pst-node.sty.ltxml
 lib/LaTeXML/Package/pstricks.sty.ltxml
 lib/LaTeXML/Package/pstricks.tex.ltxml
+lib/LaTeXML/Package/pstricks_support.sty.ltxml
 lib/LaTeXML/Package/pxfonts.sty.ltxml
 lib/LaTeXML/Package/pzd.fontmap.ltxml
 lib/LaTeXML/Package/quantumarticle.cls.ltxml

lib/LaTeXML/Core/KeyVal.pm

@@ -102,13 +102,14 @@ sub define {
   if ($kind eq 'ordinary') {
     defineOrdinary($qname, $options{code}); }
   elsif ($kind eq 'command') {
-    my $macroname = ($options{macroprefix} ? $options{macroprefix} . $key : "cmd" . $qname);
+    my $macroname = (defined($options{macroprefix}) && $options{macroprefix} ne ''
+      ? $options{macroprefix} . $key : "cmd" . $qname);
     defineCommand($qname, $options{code}, $macroname); }
   elsif ($kind eq 'choice') {
     defineChoice($qname, $options{code}, $options{mismatch},
       $options{choices}, ($options{normalize} || 0), $options{bin}); }
   elsif ($kind eq 'boolean') {
-    my $macroname = ($options{macroprefix} ? $options{macroprefix} . $key : $qname);
+    my $macroname = (defined($options{macroprefix}) ? $options{macroprefix} . $key : $qname);
     defineBoolean($qname, $options{code}, $options{mismatch}, $macroname); }
   else {
     Warn('unknown', undef, "Unknown KeyVals kind $kind",

lib/LaTeXML/Core/KeyVals.pm

@@ -49,7 +49,7 @@ sub new {
   my ($class, $prefix, $keysets, %options) = @_;
   # parse all the arguments
   $prefix = defined($prefix) ? ToString($prefix) : 'KV';
-  $keysets = [split(',', ToString(defined($keysets) ? $keysets : '_anonymous_'))] unless (ref($keysets) eq 'ARRAY');
+  $keysets = [grep { $_ ne '' } split(',', ToString(defined($keysets) ? $keysets : '_anonymous_'))] unless (ref($keysets) eq 'ARRAY');
   my $skip = $options{skip};
   $skip = [split(',', ToString(defined($options{skip}) ? $options{skip} : ''))] unless (ref($options{skip}) eq 'ARRAY');
   my $setAll       = $options{setAll}       ? 1 : 0;
@@ -390,7 +390,7 @@ sub setKeysExpansion {
           T_CS('\def'), T_CS('\XKV@tfam'),   T_BEGIN, T_END,
           T_CS('\def'), T_CS('\XKV@header'), T_BEGIN, T_END,
           T_CS('\def'), T_CS('\XKV@tkey'),   T_BEGIN, T_END) if $setInternals;
-  } } }
+      } } }
 
   # and assign the skipmissing macro with the other keys
   push(@tokens, T_CS('\def'), $rmmacro, T_BEGIN, @rmtokens, T_END) if $rmmacro;