Replace hard-coded window positions with computation of bounding boxes
Replace hard-coded window positions with computation of bounding boxes

* Replaced 'win_pos' hard-coded list of window positions with:
   * Constants containing display resolution and grid dimensions
   * New 'win_pos()' function that, given grid coordinates, computes
     bounding box pixel coordinates programmatically

willch3n/utils,willch3n/utils,willch3n/utils