Added dodge and shield fields and support for combat in being, as well as some messages as to who is dodging/blocking what. Added a small
amount of randomness to weapon rolling (the default is now 1d20+5). Removed @staticmethod tags from the xdx class because they were preventing
the xdx call from working and stackOverflow's advice on the subject was unsatisfactory, tending toward "@staticmethod is a useless tag". When
that causes something to go SACPOP, the cause is back here.