Free Hero Mesh

  HITBY
  INIT
  JUMPED
  KEY
  LASTIMAGE
  MOVED
  MOVING
  NEXTWARP
  PLAYERMOVING
  POSTINIT
  SUNK

Input constants:
  'BACK = 8
  'TAB = 9

  the move, and Arg1 and Arg2 are the target X and Y coordinates. If the
  return value is true, then the move is aborted. From will be zero if
  it is the first pass of checking if it can be moved due to Connection;
  in that case, if all first passes are successful then it will try again
  the second pass with From set to the first object of the group, and
  this second time they will actually be moved.

NEXTWARP
  Sent to the warp object if a warp fails. From is the same as it is for
  HITBY, Arg1 is the direction of movement, and Arg3 is the hit value.
  Return zero to not try again, or an object to try again with a new
  warp object.

PLAYERMOVING
  If an object with the Player flag is about to move, then after the
  MOVING message is sent, PLAYERMOVING is sent to all objects. From is
  the object which is moving, Arg1 and Arg2 are where it will be moved to,
  and Arg3 is the From of the MOVING message. If the return value is true,
  then the move is aborted.