Bullet Collision Detection & Physics Library: Featherstone -> ConstraintSolver Relation

Bullet Collision Detection & Physics Library

### Featherstone → ConstraintSolver Relation

File in src/BulletDynamics/Featherstone | Includes file in src/BulletDynamics/ConstraintSolver
--- | ---
btMultiBodyConstraintSolver.cpp | btContactSolverInfo.h
btMultiBodyConstraintSolver.cpp | btSolverBody.h
btMultiBodyConstraintSolver.h | btSequentialImpulseConstraintSolver.h
btMultiBodyFixedConstraint.cpp | btGeneric6DofSpring2Constraint.h
btMultiBodySliderConstraint.cpp | btGeneric6DofSpring2Constraint.h
btMultiBodySolverConstraint.h | btContactSolverInfo.h
btMultiBodySolverConstraint.h | btSolverBody.h
btMultiBodySphericalJointMotor.cpp | btGeneric6DofSpring2Constraint.h