We no longer test with ROOT 6.22, and in 6.32 PyROOT is coming back but subtly fails on macOS

Avoid having another level of quotes or b'' showing up in the wrong places

Typename: do not inherit from std::pair because ROOT stopped working for this construct for some reason

when the value is used as 'half-length'
replacing GetNegativeEndZ by GetPositiveEndZ fixes the problem
because GetPositiveEndZ is the user value that corresponds to half-length

I hope this will work fine. If the list of headers or linkdefs changes, then cmake should re-run anyway and that will call the file(Generate) to recreate the script, and if only the file content of headers or linkdefs changes, we only have to re-run the shell script.

because add_custom_command does not know the COMPILE_LANGUAGE we are not allowed to treat definitions with that genex inside.
We cannot use add_custom_command(TARGET because that fails with the same error, even though it maybe shouldn't

For compatibility with ninja(?) we need to use these $<CONFIG>$<COMPILE_LANGUAGE> shenanigans

add USE_COMMAND_FOR_GENERATION to fall back to old way

Adape documentation for Tube(...) constructor to reality. (Issue https://github.com/AIDASoft/DD4hep/issues/1236)