fixed bugs related to the aim ability that could cause a crash or cause the aiming tiles to not reset properly the first time
striped out statxp after realizing that it makes no sense and is redundant in weird ways. the stat field indicates the total exp, and every 100 points is one level. also had to adjust the formula for calculating movement range to be log15 instead of log4, since the numbers are going to be a lot larger. this gives one movement square at level 1, level 3, level 33 and level 506 speed. still probably needs some tweaking, since level 3 is easy to get, so might as well get everyone to level 3.