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.
I think you're looking for something like:
```
    for( auto mut : my_mutations ) {
        if( !traits[mut].powered ) {
            continue;
        }
        u.fatigue += traits[mut].cost;
        add_msg( "%s is active, and costing %d fatigue.", mut.c_str(), traits[mut].cost );
    }
```
Obviously not exactly that, I'm not totally sure how the values hook up.