- Add text_gap option to allow adjustment of vertical gap between

barcode and text
- EMF/EPS/SVG/GUI: ignore BOLD_TEXT for EAN/UPC
- DAFT: up max to 250 chars
- EMF/EPS/SVG: fix addon bars placement/length when text hidden
- Qt backend: use `QFontMetrics::horizontalAdvance()` rather than
  `boundingRect()` to calc text width (seems to be more accurate)
- library: make printf/sprintf() format arg always literal string
- output: fix errtxt nos clash;
  use array for `out_upcean_split_text()` text parts
- raster/vector: smallify addon text printing logic
- frontend: warn if output file and direct options both given;
  add TODO note about `CommandLineToArgvW()` loading shell32.dll
- manual: put HRT options in own section

backend_qt/qzint.h

@@ -165,6 +165,10 @@ public:
     void setFontSetting(int fontSettingIndex); // Sets from comboBox index
     void setFontSettingValue(int fontSetting); // Sets literal value
 
+    /* Text gap */
+    float textGap() const; // `symbol->text_gap`
+    void setTextGap(float textGap);
+
     /* Show (true) or hide (false) Human Readable Text */
     bool showText() const; // `symbol->show_hrt`
     void setShowText(bool showText);
@@ -355,6 +359,7 @@ private:
     bool m_dotty;
     float m_dot_size;
     float m_guardDescent;
+    float m_textGap;
     struct zint_structapp m_structapp;
     QString m_fgStr;
     QString m_bgStr;