Rename barcode funcs to same as BARCODE_XXX name
library: barcode funcs array for dispatch, used for ZBarcode_ValidID() also
general: change is_sane() comparison to nonzero from ZINT_ERROR_INVALID_OPTION
MAILMARK: fuller error messages
CODABAR: add option to show check character in HRT
zint.h: use 0xNNNN for OR-able defines
GUI: add guard descent height reset button, add Zint version to window title,
static get_zint_version() method, use QStringLiteral (QSL shorthand),
use SIGNAL(toggled()), add errtxt "popup" and status bar, add icons,
add saveAs shortcut, add main menu, context menus and actions, add help,
reset_view() -> reset_colours(), add copy to clipboard as EMF/GIF/PNG/TIF,
lessen triggering of update_preview(), shorten names of getters/setters,
simplify/shorten some update_preview() logic in switch,
CODEONE disable structapp for Version S
qzint.cpp: add on_errored signal, add missing getters, add test
GRIDMATRIX, MAXICODE, MICROPDF417, PDF417, QRCODE, ULTRA
DOTCODE: use pre-calculated generator poly coeffs in Reed-Solomon for
performance improvement
PDF417/MICROPDF417: use common routine pdf417_initial()
GUI: code lines <= 118, shorthand widget_obj(),
shorten calling upcean_addon_gap(), upcean_guard_descent()
various backend: var name debug -> debug_print
PLESSEY: add options NCR weighted mod-10, hide check digit(s) in HRT
test suite: now runnable under MSVC 2019, 2017, 2015, MinGW/MSYS
win32/README: update with MSVC 2019 and CMake instructions
[backend/bmp.c:133]: (error) Memory leak: bitmap
[backend/bmp.c:126]: (error) Memory leak: bitmap
[backend/composite.c:464]: (error) Array index -1 is out of bounds.
[backend/composite.c:507]: (error) Array index -1 is out of bounds.
[backend/dmatrix.c:962]: (style) Redundant condition: i!=0. 'i==0 || (i!=0 && binary[i-1]!='b')' is equivalent to 'i==0 || binary[i-1]!='b''
[backend/raster.c:122]: (error) Memory leak: rotated_pixbuf
[backend/raster.c:506]: (error) Memory leak: pixelbuf
[frontend/main.c:273]: (error) Uninitialized variable: format_string
[frontend_qt/exportwindow.cpp:103]: (style) Array index 'j' is used before limits check.
Patch from Michael <virtual_worlds@gmx.de>
Full text: As usual I have modified only minor things to remove warnigs when compiled as C++ code, have added some const-specifiers where possible to help the compiler create more efficient code and added some static-specifiers to make functions invisible to other modules.
