Add Character control to btDiscreteDynamicsWorld (moved btCharacterControllerInterface/btKinematicCharacterController functionality from demo)

Remove ibmsdk from CcdPhysicsDemo and CollisionDemo

src/BulletDynamics/Dynamics/btDynamicsWorld.h

@@ -23,6 +23,7 @@ class btTypedConstraint;
 class btRaycastVehicle;
 class btConstraintSolver;
 class btDynamicsWorld;
+class btCharacterControllerInterface;
 
 /// Type for the callback for each tick
 typedef void (*btInternalTickCallback)(btDynamicsWorld *world, btScalar timeStep);
@@ -75,6 +76,11 @@ public:
 
 		virtual void	removeVehicle(btRaycastVehicle* vehicle) {(void)vehicle;}
 
+		virtual void	addCharacter(btCharacterControllerInterface* character) {(void)character;}
+
+		virtual void	removeCharacter(btCharacterControllerInterface* character) {(void)character;}
+
+
 		//once a rigidbody is added to the dynamics world, it will get this gravity assigned
 		//existing rigidbodies in the world get gravity assigned too, during this method
 		virtual void	setGravity(const btVector3& gravity) = 0;