Better mob animations/textures

Some of the old mobs feel very bland when compared to newer mobs such as the warden or sniffer. I think that certain mobs (zombie, skeleton, chicken) should be given new textures and animations that meet the standard of everything new. Some mobs should definitely stay the same (creeper and pig) but I think that there are a lot of really good possibilities and that a change like this would make the game feel much more polished.