Offer-motivated features: :hline defaults, ranged :hpos, @date :days, :bottom none

- @table: a writer's :hline/:vline replaces the default lines; new
  boundary name 'none' removes all lines
- @table: ranged :hpos argument overrides :cell_hpos per cell
  (\multicolumn{1} in tex; positions a colspan anchor's merged cell)
- @date/@datetime: :days offset argument (sks/date/date.py)
- @document: ":bottom none" suppresses the footer (\pagestyle{empty})

Also carries the escape-system generator/renderer fixes, per-cell-range
:format, and uppercase .TTF/.OTF font recognition from klammertext-dev.

sks/target/latex_util.cpp

@@ -192,7 +192,10 @@ namespace latex {
         ss << "\\newcommand{\\documenttwocolumn}{" << (two_column ? "true" : "false") << "}\n";
         ss << "\\newcommand{\\documentlandscape}{" << (landscape ? "true" : "false") << "}\n";
         ss << "\\newcommand{\\documentisbook}{" << (book_format ? "true" : "false") << "}\n";
-        if (!bottom.empty()) {
+        // ":bottom none" suppresses the footer entirely: no \documentbottom,
+        // and \pagestyle{empty} replaces the sks page styles below.
+        bool no_footer = (bottom == "none");
+        if (!bottom.empty() && !no_footer) {
             ss << "\\newcommand{\\documentbottom}{" << bottom << "}\n";
         }
 
@@ -255,7 +258,7 @@ namespace latex {
             ss << book_verso_page(copyright);
 
             // Table of contents (starts on page iii, recto)
-            ss << "\\pagestyle{noheader}\n"
+            ss << "\\pagestyle{" << (no_footer ? "empty" : "noheader") << "}\n"
                << "\\tableofcontents\n";
 
             // Advance to the next recto page for the body.
@@ -270,9 +273,13 @@ namespace latex {
             ss << "\\clearpage\n"
                << "\\thispagestyle{empty}\\mbox{}\\clearpage\n"
                << "\\pagenumbering{arabic}\n"
-               << "\\pagestyle{sksbook}\n";
+               << "\\pagestyle{" << (no_footer ? "empty" : "sksbook") << "}\n";
         } else {
-            ss << "\\pagestyle{sks" << structure << "}\n\n";
+            if (no_footer) {
+                ss << "\\pagestyle{empty}\n\n";
+            } else {
+                ss << "\\pagestyle{sks" << structure << "}\n\n";
+            }
             // Plain or article: title block with optional copyright footnote
             if (!copyright.empty()) {
                 ss << "\\renewcommand{\\thefootnote}{}\n";