Allow the import of Shapefiles

There are a number of professional mapping applications that can be exported to shapefiles.
I make large maps using GIS and print them out on sheets as 1" squares.
For me at least, I can create a map very quickly.
However, now that I have this application, I would like to be able to import those squares as a shapefile and then use Dungeon Alchemist to dress them up.