Introduced btActionInterface. This makes it easier to extend user-defined actions, such as vehicles and characters.

btRaycastVehicle and btKinematicCharacterController are derived from btActionInterface now.
Some cosmetic cleanup: changed sourceforce/sf.net url to bulletphysics.com.

src/BulletDynamics/Dynamics/btDynamicsWorld.h

@@ -20,10 +20,10 @@ subject to the following restrictions:
 #include "BulletDynamics/ConstraintSolver/btContactSolverInfo.h"
 
 class btTypedConstraint;
-class btRaycastVehicle;
+class btActionInterface;
 class btConstraintSolver;
 class btDynamicsWorld;
-class btCharacterControllerInterface;
+
 
 /// Type for the callback for each tick
 typedef void (*btInternalTickCallback)(btDynamicsWorld *world, btScalar timeStep);
@@ -72,14 +72,9 @@ public:
 
 		virtual void	removeConstraint(btTypedConstraint* constraint) {(void)constraint;}
 
-		virtual void	addVehicle(btRaycastVehicle* vehicle) {(void)vehicle;}
-
-		virtual void	removeVehicle(btRaycastVehicle* vehicle) {(void)vehicle;}
-
-		virtual void	addCharacter(btCharacterControllerInterface* character) {(void)character;}
-
-		virtual void	removeCharacter(btCharacterControllerInterface* character) {(void)character;}
+		virtual void	addAction(btActionInterface* action) = 0;
 
+		virtual void	removeAction(btActionInterface* action) = 0;
 
 		//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
@@ -129,6 +124,16 @@ public:
 		}
 
 
+		///obsolete, use addAction instead.
+		virtual void	addVehicle(btActionInterface* vehicle) {(void)vehicle;}
+		///obsolete, use removeAction instead
+		virtual void	removeVehicle(btActionInterface* vehicle) {(void)vehicle;}
+		///obsolete, use addAction instead.
+		virtual void	addCharacter(btActionInterface* character) {(void)character;}
+		///obsolete, use removeAction instead
+		virtual void	removeCharacter(btActionInterface* character) {(void)character;}
+
+
 };
 
 #endif //BT_DYNAMICS_WORLD_H