Outlined the interface for the GameObject ADT.  the GameObject encapsulates
a name, position, orientation, and size.  it will have several helper placement
methods like putAbove, putBelow, putLeft, etc...  there is also a toCREF() method
for when we want to write it out to a file.

TODO:

  * comments
  * implement the placement functions
  * implement the toCREF functions
  * find out where to get size information
  * handling the orientation is going to be interesting.