* Can build on top of windows
-Players can now build things while standing on the same tile as a directional window.
* Changed the check for fulltile
-This actually covers all fulltile windows
* No more stacking windows
-Full tiles can no longer be built on top of directional windows
-Directional windows can still be built on the same tile as long as they dont face the same direction
* Now contains 50% less IF!!
-Put both if's into one
* Still pretty fucky
-If the dir of the constructed object has var fulltile set to TRUE then FULLTILE_WINDOW_DIR will be passed to the method valid_window_location else the user's dir is passed.
* just a space
* Now gets initial dir of object being built and passes that to valid_window_location
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