Alternate limb targeting keybinds

[qrqwerqwr]

Allow the numpad to be used for targeting limbs, with the numbers on it corresponding to the limbs on the targeting menu. Head = 8, chest = 5, right arm = 4, left arm = 6, right leg = 1, and left leg = 3. By adding this as a complement to the traditional numeric row targeting, instead of replacing it, it allows users with keyboards lacking the numpad, e.g. TKL keyboards and smaller, to still be able to target limbs, while providing a small QoL change.