Simplify Cmake files using specific targets methods and removing variables.
Remove RobotDART link to inria_wbc (keep link to examples)
Separate Cmake files for robot_Dart examples
Add namespace inria_wbc:: (to link in other project we will use inria_wbc::inria_wbc)
Simplify Cmake files using specific targets methods and removing variables. Remove RobotDART link to inria_wbc (keep link to examples) Separate Cmake files for robot_Dart examples Add namespace inria_wbc:: (to link in other project we will use inria_wbc::inria_wbc)