Find Boost 1.70 using CMake Config mode approach
From Boost 1.70, CMake config files are generated by Boost in the lib folder. The FindBoost.cmake module provided by CMake will automatically use the files provided by Boost if they are present. These files use a more modern approach, so it will require some changes to adjust to the new way of doing things. First solution is to set Boost_NO_BOOST_CMAKE to TRUE to use the old behavior. We should switch to the new way of doing it, but first we need to consider how the dependencies is best propagated to other projects from RobWork with the new approach.