Config file, looting, and other drops

Added in robust configuration file support, including command lines to
load/save/reset, as well as command lines to modify drop rates and
entity ID's affected.  Also reduced default drop rate to 3% per Bane
level, adding on 2% per looting level if available.  New maximum
droprate is 21% by default.  Added in default to disable regular drops
from an enemy if an egg is generated.  This can be disabled through
config file or through command line.