Revert "Midstream on #8 : Reverted to using ImageDisplay and cut out the properties change event handler, to show how it looks before getting horked up"

This reverts commit f6f635a5839a15054f3c812ea4ea37566a0bf426.
Midstream on #8 : Grid drawing works as expected now, but the TilesetPropertiesChangedEvent is not bubbling up like it should, so the grid can't change