Draft: Use configure_file to generate compiler script

Summary

• The compiler script is now based on a template file cmake/scripts/compiler.sh.in
• It is generated using configure_file() command of cmake
• The cmake variables CMAKE_CXX_FLAGS and CMAKE_CXX_COMPILER are not touched anymore
• Filtering flags happens inside of the compiler script not by modifying the cmake environment
• The output of the compiler script can be activated using the VERBOSE flag
• Instead of setting the compiler, this MR uses the CMAKE_CXX_COMPILER_LAUNCHER technique, i.e., the original compiler is forwarded to the script as first argument and the original CMAKE_CXX_COMPILER variable does not need to be touched.