glTF and Option to Only Download Animations

I added a .glTF version of the animations for engines such as Godot. I've actually had pretty good luck with .fbx in Godot, but now there's the option to get them for the more "native" format. You can also get the .fbx animations without the model attached now. I included the model mostly for beginners and quick previews. In reality most people are going to want to re-target the animations to their own character and will barely use the included model, if at all. This gives them the files they want and takes up half the space. Oh, if people just wanted the conversion script(I don't know if anyone else will every actually use this haha) or rig, it's now also available separately.