EAN/UPC: add quiet zone indicators option (API output_options

`EANUPC_GUARD_WHITESPACE`, CLI `--guardwhitespace`) (ticket #287)
EAN-2/EAN-5: HRT now at top instead of at bottom for standalones,
  following BWIPP
CLI: batch mode: don't close input if stdin
EAN/UPC: fix excess 1X to right of add-ons
Composites: fix excess whitespace; fix quiet zone calcs to allow
  for linear shifting
CLI: use own (Wine) version of `CommandLineToArgvW()` to avoid
  loading "shell32.dll"
Move "font.h" -> "raster_font.h"
EPS/SVG: use new `out_putsf()` func to output floats, avoiding
  trailing zeroes & locale dependency
EPS: simplify "TR" formula
SVG: change font from "Helvetica, sans serif" to "OCR-B, monospace";
  use single "<path>" instead of multiple "<rect>"s to draw boxes
  (reduces file size)
Add `EMBED_VECTOR_FONT` to `output_options` (CLI `--embedfont`) to
  enable embedding of font in vector output - currently only for
  SVG output of EAN/UPC
GUI: use "OCR-B" font for EAN/UPC and "Arimo" for all others (was
  "Helvetica" for both); paint background of screen preview light
  grey so as contrasts with whitespace and quiet zones
EMF: prefix funcs with `emf_`; simplify string `halign` handling
large: rename `large_int` -> `large_uint`
CODE128/common: move `c128_hrt_cpy_iso8859_1()` to
  `hrt_cpy_iso8859_1()` and add `ZINT_WARN_HRT_TRUNCATED` warning
  (for future use)
Various symbologies: replace `printf()` with `fputs()`
  (symbol->debug)
QRCODE: better assert(), removing a NOLINT (2 left)
CLI: add some more barcode synonyms for DBAR
common: various fiddlings
CMake: don't include png.c unless ZINT_USE_PNG (avoids clang
  warning)

backend/tests/data/print/svg/code128_aim.svg

@@ -1,35 +1,12 @@
 <?xml version="1.0" standalone="no"?>
-<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
-   "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
-<svg width="136" height="119" version="1.1"
-   xmlns="http://www.w3.org/2000/svg">
-   <desc>Zint Generated Symbol
-   </desc>
-
-   <g id="barcode" fill="#000000">
-      <rect x="0" y="0" width="136" height="119" fill="#FFFFFF" />
-      <rect x="0.00" y="0.00" width="4.00" height="100.00" />
-      <rect x="6.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="12.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="22.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="26.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="34.00" y="0.00" width="4.00" height="100.00" />
-      <rect x="44.00" y="0.00" width="4.00" height="100.00" />
-      <rect x="54.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="62.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="66.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="70.00" y="0.00" width="6.00" height="100.00" />
-      <rect x="78.00" y="0.00" width="4.00" height="100.00" />
-      <rect x="88.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="92.00" y="0.00" width="6.00" height="100.00" />
-      <rect x="100.00" y="0.00" width="4.00" height="100.00" />
-      <rect x="110.00" y="0.00" width="4.00" height="100.00" />
-      <rect x="120.00" y="0.00" width="6.00" height="100.00" />
-      <rect x="128.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="132.00" y="0.00" width="4.00" height="100.00" />
-      <text x="68.00" y="114.00" text-anchor="middle"
-         font-family="Helvetica, sans-serif" font-size="14.0" >
-         AIM
-      </text>
-   </g>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg width="136" height="119" version="1.1" xmlns="http://www.w3.org/2000/svg">
+ <desc>Zint Generated Symbol</desc>
+ <g id="barcode" fill="#000000">
+  <rect x="0" y="0" width="136" height="119" fill="#FFFFFF"/>
+  <path d="M0 0h4v100h-4ZM6 0h2v100h-2ZM12 0h2v100h-2ZM22 0h2v100h-2ZM26 0h2v100h-2ZM34 0h4v100h-4ZM44 0h4v100h-4ZM54 0h2v100h-2ZM62 0h2v100h-2ZM66 0h2v100h-2ZM70 0h6v100h-6ZM78 0h4v100h-4ZM88 0h2v100h-2ZM92 0h6v100h-6ZM100 0h4v100h-4ZM110 0h4v100h-4ZM120 0h6v100h-6ZM128 0h2v100h-2ZM132 0h4v100h-4Z"/>
+  <text x="68" y="114" text-anchor="middle" font-family="Helvetica, sans-serif" font-size="14">
+   AIM
+  </text>
+ </g>
 </svg>