The ability to remove head + neck and heel frame parts#874

Head + neck: It’s an inconsequential set of parts in terms of animation, so having it be removable would pose no problem. Plus, it’d give way for headless mechs without a need for a new frame.

Heel: The front part of the foot is what “does all the stepping”, so to speak. Having the heel be removable would make way for smaller feet and semi-digitgrade legs.