Active mutation expansion/bugfix

This makes a few more mutations Active: the Retractable Claws, Insect Wings, and combat tails.  Also fixes #8959.

And player::suffer will need some love.  Sorry, folks, the flood of new mutations just got pushed back again.
It's time-per-cost. The 'time' slot is how many turns before you have to pay the cost again or else it deactivates. If it has no cost, it never deactivates until you tell it to do so.