[C++] JointFreeFlyer is now CRTP
[C++] JointFreeFlyer is now CRTP

fvalenza/pinocchio,aelkhour/pinocchio,fvalenza/pinocchio,aelkhour/pinocchio,fvalenza/pinocchio,aelkhour/pinocchio,aelkhour/pinocchio,fvalenza/pinocchio