Critter upgrade

Based on http://smf.cataclysmdda.com/index.php?topic=5150.0 ; handles
#5394.

Upgrades most all the zeds and some of the more hostile critters;
downgrades zed-dogs' dodge due to consistent complaints about inability
to hit 'em.

W_BLOCK might stand a bit of down-tuning, though.
Merge pull request #5972 from KA101/critter-tweakup

Critter upgrade