D13394: C++: update for c++20 and fix some syntax errors

[jonathan poelen]

jpoelen added inline comments.

INLINE COMMENTS

> dhaumann wrote in gcc.xml:576-577
> These can be WordDetect as well, right?

It does not work because of ':'. But Putting it in `weakDeliminator` will break things.    
For this to work, it would need `additionalDeliminator` and `weakDeliminator` attributes for WordDetect (and Keyword).

REPOSITORY
  R216 Syntax Highlighting

BRANCH
  cpp

REVISION DETAIL
  https://phabricator.kde.org/D13394

To: jpoelen, dhaumann, cullmann
Cc: cullmann, kde-frameworks-devel, michaelh, ngraham, bruns
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