Chicken model tweaks

Chicken (specifically the warm and temperate variants) should receive tail feathers and crests to not only be more consistent with the cold chickens, but also make them more accurate to the game's decision to make all their animal possess the traits of both male and female animals. Chickens are the only livestock/common animal in the game to not really follow this so now would be a perfect time to rectify this and to make them more consistent with their cold variant.