Fix compilation errors with clang 17 and modern C++ compilers (#218)

Update README.md

Create codeql-analysis.yml

merge v4.0.9.9000 (pre-4.0.10) back into main

final tweaks heading towards overdue CRAN-friendly maintenance

performance clang-tidied

use hpp for c++ headers

clang tidy, up to C++17, now its 2021

fix a test for R 4.1-devel factor generation compatibility

finish use of R 3.5 askYesNo instead of backport, to avoid CRAN check warnings

Merge remote-tracking branch 'refs/remotes/antibes/v4.0.9.9000' into v4.0.9.9000

bring up to R 3.5, use new rda format, fix rhub script [ci skip]

[ci skip] ignore a file that other branches might generate

master to main

[ci skip] gitignores