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/svg/ean5.svg

@@ -1,32 +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="118" height="117" 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="118" height="117" fill="#FFFFFF" />
-      <rect x="14.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="18.00" y="0.00" width="4.00" height="100.00" />
-      <rect x="24.00" y="0.00" width="4.00" height="100.00" />
-      <rect x="32.00" y="0.00" width="4.00" height="100.00" />
-      <rect x="38.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="44.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="50.00" y="0.00" width="4.00" height="100.00" />
-      <rect x="56.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="60.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="70.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="74.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="78.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="86.00" y="0.00" width="4.00" height="100.00" />
-      <rect x="92.00" y="0.00" width="2.00" height="100.00" />
-      <rect x="96.00" y="0.00" width="4.00" height="100.00" />
-      <rect x="106.00" y="0.00" width="2.00" height="100.00" />
-      <text x="61.00" y="116.10" text-anchor="middle"
-         font-family="Helvetica, sans-serif" font-size="20.0" >
-         12345
-      </text>
-   </g>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<svg width="104" height="118" 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="104" height="118" fill="#FFFFFF"/>
+  <path d="M0 18h2v100h-2ZM4 18h4v100h-4ZM10 18h4v100h-4ZM18 18h4v100h-4ZM24 18h2v100h-2ZM30 18h2v100h-2ZM36 18h4v100h-4ZM42 18h2v100h-2ZM46 18h2v100h-2ZM56 18h2v100h-2ZM60 18h2v100h-2ZM64 18h2v100h-2ZM72 18h4v100h-4ZM78 18h2v100h-2ZM82 18h4v100h-4ZM92 18h2v100h-2Z"/>
+  <text x="47" y="15.6" text-anchor="middle" font-family="OCRB, monospace" font-size="20">
+   12345
+  </text>
+ </g>
 </svg>