Fixes/ninja buffs.

Fix details are in their various commits. Thanks to JimTheCactus and VampyrBytes for tracking down and fixing the human icon caching bug.

Ninja buffs are:
- Suits with supporting_organs set will automatically splint broken limbs when they fracture.
- Removing the suit will remove the splints, and if a suit is supporting a limb then splints can't be removed.
- Ninja suit can now inject tramadol.
- Ninja suit has a breach threshold of 30 (12 more than hardsuits).