ColisionAvoidance: move instantiation to FlightTask

src/lib/CollisionAvoidance/CollisionAvoidance.cpp

src/lib/CollisionAvoidance/CollisionAvoidance.hpp

src/lib/FlightTasks/FlightTasks.hpp

src/lib/FlightTasks/tasks/FlightTask/FlightTask.hpp

...htTasks/tasks/ManualPosition/FlightTaskManualPosition.cpp

...htTasks/tasks/ManualPosition/FlightTaskManualPosition.hpp

src/modules/mc_pos_control/mc_pos_control_main.cpp

src/modules/mc_pos_control/mc_pos_control_params.c