Actually change SVG font to "Arimo, Arial, sans-serif" ([607e4ed])

Allow `--embedfont` for non-EAN/UPC SVG also (& update GUI)
SVG: add "fonts/normal_woff2.h"; use array syntax for it &
  "fonts/upcean_woff2.h" to avoid large strings
GUI: embed Arimo (via "fonts/normal_ttf.h"), same as OCRB
Change textgap max 5X -> 10X
README: make list of barcodes 2-col table for readability
win32/README: note Visual Studio 2022 re CMake

docs/images/code128.svg

@@ -5,7 +5,7 @@
  <g id="barcode" fill="#000000">
   <rect x="0" y="0" width="591" height="286" fill="#FFFFFF"/>
   <path d="M0 0h9.6v240h-9.6ZM14.4 0h4.8v240h-4.8ZM28.8 0h14.4v240h-14.4ZM52.8 0h4.8v240h-4.8ZM67.2 0h9.6v240h-9.6ZM81.6 0h14.4v240h-14.4ZM105.6 0h9.6v240h-9.6ZM124.8 0h9.6v240h-9.6ZM139.2 0h9.6v240h-9.6ZM158.4 0h4.8v240h-4.8ZM168 0h9.6v240h-9.6ZM196.8 0h4.8v240h-4.8ZM211.2 0h4.8v240h-4.8ZM220.8 0h19.2v240h-19.2ZM244.8 0h14.4v240h-14.4ZM264 0h14.4v240h-14.4ZM292.8 0h4.8v240h-4.8ZM302.4 0h9.6v240h-9.6ZM316.8 0h4.8v240h-4.8ZM331.2 0h14.4v240h-14.4ZM355.2 0h9.6v240h-9.6ZM369.6 0h14.4v240h-14.4ZM388.8 0h9.6v240h-9.6ZM403.2 0h14.4v240h-14.4ZM422.4 0h14.4v240h-14.4ZM441.6 0h4.8v240h-4.8ZM456 0h9.6v240h-9.6ZM475.2 0h14.4v240h-14.4ZM494.4 0h9.6v240h-9.6ZM508.8 0h14.4v240h-14.4ZM528 0h9.6v240h-9.6ZM552 0h14.4v240h-14.4ZM571.2 0h4.8v240h-4.8ZM580.8 0h9.6v240h-9.6Z"/>
-  <text x="295.2" y="273.6" text-anchor="middle" font-family="Helvetica, sans-serif" font-size="33.6">
+  <text x="295.2" y="273.6" text-anchor="middle" font-family="Arimo, Arial, sans-serif" font-size="33.6">
    130170X178
   </text>
  </g>