[CR] Add dexterity nerfs as explanations for melee misses

The list of melee miss explanations is stored with the player, and
added to when the effects on the player are applied each turn.
"That critter's jumpin' around like a jitterbug!  It needs to mellow out."

(joking)
BECAUSE YOU USED DRUGS, YOU'RE LOSING THE FIGHT.  LOSER.
--William S. Sessions, Director, FBI
(/joking)