Revise the build environment

Use C++17 as C++ standard for the compilation of CbmRoot.
Check if compiler supports the C++17 standard.
Check if also FairSoft was compiled with C++17.
Check the required versions of ROOT (at least Root6), FairSoft( at least apr21)
and FairRoot (at leass v18.6.7).
If any of the checks fail stop the configuration with a meaningful error
message.
Remove some switches which are not needed any longer.
Remove checks for C++11 features. No need to check them any longer, since the
new standard is noe C++17.