D21585: C++: update for C++20

[jonathan poelen]

This revision was automatically updated to reflect the committed changes.
Closed by commit R216:9ba02971123d: C++: update for C++20 (authored by jpoelen).

REPOSITORY
  R216 Syntax Highlighting

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D21585?vs=59156&id=59162

REVISION DETAIL
  https://phabricator.kde.org/D21585

AFFECTED FILES
  autotests/folding/highlight.cpp.fold
  autotests/html/highlight.cpp.html
  autotests/input/highlight.cpp
  autotests/reference/highlight.cpp.ref
  data/syntax/isocpp.xml

To: jpoelen, #framework_syntax_highlighting, dhaumann, cullmann
Cc: kwrite-devel, kde-frameworks-devel, LeGast00n, gennad, bmortimer, domson, michaelh, genethomas, ngraham, bruns, demsking, cullmann, vkrause, sars, dhaumann
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