Revert "Rearrange and change of member names"

src/CMakeLists.txt

src/Mathematics/relative-feet-inequalities.cpp

src/Mathematics/relative-feet-inequalities.hh

src/PreviewControl/SupportFSM.cpp

src/PreviewControl/SupportFSM.h

src/ZMPRefTrajectoryGeneration/ZMPVelocityReferencedQP.cpp

src/ZMPRefTrajectoryGeneration/ZMPVelocityReferencedQP.h

src/ZMPRefTrajectoryGeneration/generator-vel-ref.cpp

src/ZMPRefTrajectoryGeneration/generator-vel-ref.hh

src/ZMPRefTrajectoryGeneration/qp-problem.cpp

src/ZMPRefTrajectoryGeneration/qp-problem.hh