The OBJECT_MOVER moves an object to a specified endpoint at a user
defined speed. The object movers may be linked together (ie, using
another OBJECT_MOVER as an endpoint) in order to move an object in
an arbitarily shaped path.

The OBJ_HOLDER object allows any object to hold another. A third link
to the OBJ_HOLDER can act as a switch to control when this behavior
will take place.

The SWITCH_MOVER object will move an object to the current position
of a second object when the state of the second object is in the ON
state. Once the movement of the first object is executed the switch
mover is deleted.

Force Fields

When these objects are activated they will prohibit a player from
crossing them. They can be up to one screen in height. They are
useful for forcing a player to move in a certain direction.

Doors and Trap Doors

The SWITCH_DOOR object is a switch activated door that is closed when
its link is inactive and open when its link is active.

The TRAP_DOOR2 and TRAP_DOOR3 objects are placed on the floor and behave
in the same way as the SWITCH_DOOR object.

Platforms and Steps
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