Normal Human Arm(s) option for robotic arms 1, 2, and 3

[PoptartsNinja]

As a way to get around one of the game's color limitations, adding perfectly normal human arms to the robotic arms options seems like a really good way to allow players to use certain full-body tops in new and interesting ways while taking advantage of an asset that already exists in-game: the bare arm geometry that certain jackets-with-sleeves options already use.