[FEATURE] Finer control over vanilla armor pieces

[Eir-nya]

Currently, although armor_model exists and allows manipulating the helmet, chestplate, leggings, and boots in general, there exists no way (at least that I could find) to move individual armor pieces. For example, the shoulder pads that come with a vanilla chestplate (attached to the left and right arms instead of the torso), the individual left and right parts for leggings and boots, or the part of vanilla leggings that covers the waist (parented to the torso).

Having the option to independently move these pieces would help a lot. Something like a custom ladder climbing animation, for instance, could not be made to look good at present while wearing a chestplate, without either hiding the vanilla armor entirely, or disabling and remaking the vanilla armor in a custom model.