How to Add Tiles
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The tiles directory is "modules/Dragon\ Hunt/images/tiles".

Sets of tiles should go in a sub-directory that is logically named.

New tiles must be added to the walk definition file
"modules/Dragon\ Hunt/data/walk_defs.txt"
with the binary value of whether or not this tile can be walked upon.

Item tiles have several requirements: 
They must go in the items directory.  They must be named
background_item_name.png where background is the name of the tile to replace it
with when the item is picked up.  The name of the item should follow the
background with underscores replacing any spaces in the item name.

For example, an item tile called "grass_healing_potion.png" has a background
tile called "grass.png" and the item is a "healing potion"
