Set UseLaunchers for Unix Makefiles and Ninja generators
Set UseLaunchers for Unix Makefiles and Ninja generators

There's an error in CMake that parses Clang warnings as errors otherwise.

Also, disable warnings in documentation.

MITK/MITK,MITK/MITK,MITK/MITK,MITK/MITK,MITK/MITK,MITK/MITK