I made a few tree-sitter queries for improving the highlighting of C++.
There is one query that I'm not totally certain about and would
appreciate some feedback on it, the one that concerns attributes.
Many editor only highlight the identifier as a keyword (This is the
behavior implemented in this commit), while others, for example the
tree-sitter plugin for neovim, tags the entire attribute for
highlighting (double brackets included). I don't know which one is
preferable. Here are screenshots of the two versions:


Release Notes:
- Fixed C++ attributes identifiers being wrongly highlighed through the
tag "variable"
- C++ attribute identifiers (nodiscard,deprecated, noreturn, etc.. ) are
now highlighted through the tag "keyword"
- Changed C++ primitives types (void, bool, int, size_t, etc.. ) to no
longer be highlighted with the tag "keyword", they can now be
highlighted by the tag "type.primitive".
- Added a tag "concept" for highlighting C++ concept identifiers. (This
tag name has been chosen to be the same than the one returned by
clangd's semantic tokens)