The Follow class is a motion class which allows actors to follow other actors.
Sets up the Follow class. If specified, it assigns the parameters to their corresponding properties.
Moves the client actor towards the who actor.
Just an empty place holder method in Follow.
If specified, it sets the x and y properties to newX and newY. Otherwise, it sets the x and y properties to the who's coordinates.
Returns TRUE if distance to the who is less than or equal to the distance property. Otherwise, it returns FALSE.