Dismemberment

Sorry about having to make a clean PR.

- Admin button to change limb types
- You can now dismember peoples limbs!
- MELEE DISMEMBERMENT
- GUN DISMEMBERMENT
- Augmentation reworked to be nicer using this system
- Augmentation surgery reworked to be a limb removal surgery
- A Bunch of useful procs for future projects involving organs/limbs
- drop_both_hands() proc which calls left and right hand dropping procs for you
- The less limbs you have the slower you walk (if you survive with no legs you can CRAWL with your arms)
- Adds human_parts.dmi which was produced by Nienhaus
- Unused human mutantrace SPRITES have been added for admin fuckery
- Limbs can be de-constructed for Biotech, SCIENCE!
- Perhaps some other things I forgot
- fixes #2738 - Cheers @Incoming5643

DON'T MERGE UNTIL:

- <del>I've tested things </del> - Feel free to do your own tests, I've tested and fixed some issues.
- <del>I've implemented a way to get the augments/replacement limbs</del> - You can create them at the Robot/Mech fabricator after a little amount of RnD work. (Biotech 3 programming 3 for Limbs, Biotech 4 for Chest/Head)

- At @MrPerson / My Request there will be some testing on the Test server, It will be organised soon.