Eliminate the feasibility of micro-managing ring hunger by swapping
back and forth between a pair of rings of slow digestion. Wearing
one at a time causes normal ring hunger (wearing both at once just
increases such hunger), but being able to put on the second ring
and take off the first just before the 1 out of 20 turns where it
affects hunger, then vice versa a few turns later, is an insanely
tedious way to avoid any hunger at all, made possible by the 'time'
option. Make the turns where extra hunger get imposed be randomized
so that that can't be done reliably.
Also closes githib issue #336: hunger caused by melee attacking
adds ring and amulet hunger a second time for that turn. That has
always been intentional behavior; now the amount varies for any
given attack due to the randomization, but on average is the same
as before.
Closes#336
bf3697c122