Add support for specifying additional CMake arguments for cmake-based projects

[traversaro]

This could be done for example in pkg_additional_info.yaml by adding :

image_tools:
  build_number: 8
  additional_cmake_args: "-DOPTION_ONE:BOOL=OFF -DOPTION_TWO:STRING=YES"

see RoboStack/robostack.github.io#17 (comment) .