When adding new creatures to the encounter or group,
read item and custom property values directly from a
file and set them on the creature.
The file would contain XML that would map creature
names (Orcs, Bugbears etc), to a set of default values
for them. These default values can contain item data
like init bonus and icons and then values for any
custom properties. This will greatly simplify creature
When adding the creature, a lookup is performed agains
the creatures in the file and all relavant data is set.