Add support for custom Horse and Wolf mobs

My suggestion is fairly straight forward, MCreator currently lacks the ability to make custom horse or wolf mobs. I just spent two days making a custom wolf skin and associated items to summon my special wolf, only to find that MCreator doesn't support that mob yet--oof.... Same problem with horses and their armor. The lack of horse support is going to hurt progress on my medieval mod. We NEED more mob support please!!