www/cutelyst: update to v4, Qt6 (+ support libraries)

New templating system cutelee replaces grantlee, but there's lots of
releases between the last FreeBSD port version and current release:
https://github.com/cutelyst/cutelyst/releases (many)
https://github.com/cutelyst/cutelee/releases (many)
https://github.com/cutelyst/asql/releases/tag/v0.92.0