- Add new symbologies BARCODE_EAN8, BARCODE_EAN_2ADDON,

`BARCODE_EAN_5ADDON`, `BARCODE_EAN13`, `BARCODE_EAN8_CC` and
  `BARCODE_EAN13_CC` as replacements for `BARCODE_EANX`,
  `BARCODE_EANX_CHK` and `BARCODE_EANX_CC` and use in CLI/GUI
  (`BARCODE_EANX` etc. marked as legacy)
- For EAN/UPC accept space as alternative add-on separator to '+',
  and accept GTIN-13 format with & without 2-digit or 5-digit
  add-on (no separator)
- Buffer length of member `errtxt` in `zint_symbol` extended 100
  -> 160 (will be sufficient for eventual translation and
  gs1-syntax-dictionary errors hopefully)
- UPC-E: warn if first digit of 7 (or 8 if check digit given) not
  '0' or '1'
- manual: update for new EAN symbologies and mention EANX now
  legacy but still supported

docs/images/ean_5addon_gws.svg

@@ -0,0 +1,15 @@
+<?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="208" height="302" 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="208" height="302" fill="#FFFFFF"/>
+  <path d="M0 36h4v265.45h-4ZM8 36h8v265.45h-8ZM20 36h12v265.45h-12ZM40 36h4v265.45h-4ZM48 36h4v265.45h-4ZM56 36h4v265.45h-4ZM72 36h8v265.45h-8ZM84 36h4v265.45h-4ZM92 36h4v265.45h-4ZM112 36h4v265.45h-4ZM120 36h4v265.45h-4ZM132 36h4v265.45h-4ZM144 36h8v265.45h-8ZM156 36h4v265.45h-4ZM168 36h8v265.45h-8ZM184 36h4v265.45h-4Z"/>
+  <text x="94" y="31.2" text-anchor="middle" font-family="OCRB, monospace" font-size="40">
+   54321
+  </text>
+  <text x="210" y="31.2" text-anchor="end" font-family="OCRB, monospace" font-size="40">
+   &gt;
+  </text>
+ </g>
+</svg>