Added means of obtaining a reference to the Cell that corresponds to a CellPanel.
Added means of obtaining a reference to the Cell that corresponds to a CellPanel.
Added means of obtaining a reference to the Map that corresponds to a Cell.  Also added ability to detect if any entities were present in the Cell.
Added paths to corresponding image files.
Deleted registerCellPane() code as it's not really needed.
Re-establishing earlier behaviours under the new paradigm.
Re-establishing earlier behaviours under the new paradigm.