starting refactor for constraint flags

CMakeLists.txt

include/bezier-com-traj/data.hh

include/bezier-com-traj/solve.hh

include/bezier-com-traj/waypoints/waypoints_c0_dc0_c1.hh

include/bezier-com-traj/waypoints/waypoints_c0_dc0_dc1_c1.hh

...ude/bezier-com-traj/waypoints/waypoints_c0_dc0_ddc0_c1.hh

...bezier-com-traj/waypoints/waypoints_c0_dc0_ddc0_dc1_c1.hh

...r-com-traj/waypoints/waypoints_c0_dc0_ddc0_ddc1_dc1_c1.hh

include/bezier-com-traj/waypoints/waypoints_definition.hh

src/CMakeLists.txt

src/solve_transition.cpp

tests/test-transition.cc