Method MovingEntity

This is the constructor that should be used when creating an unnamed MovingEntity @param position initial world position @param radius bounding radius @param velocity initial velocity @param max_speed maximum speed @param heading initial heading @param mass initial mass @param max_turn_rate how fast

( 
			Vector2D position,
			double   radius,
			Vector2D velocity,
			double   max_speed,
			Vector2D heading,
			double   mass,
			double   max_turn_rate,
			double   max_force)