replaces all mentions of bodypart_robotic with is_robotic_limb() where possible, adds BODYPART_HYBRID, adds helpers for organic / robotic limbs (is_robotic_limb() / is_organic_limb(), with a arg to override it accepting hybrid limbs)
Also makes the the surgery to heal robotic limbs work if the torso isn't a robot, but rather if there are robotic bodyparts, makes the IPC brain repair.. only accept IPC brains (obviously), makes the damage threshholds for robo-limbs vars instead of a fix 25 with hybrid ones predefined at 25 / 15 (trigger / mindamage), adds an error message to fixing them if already at theshhold, etc. Now just for replacing BODYPART_ORGANIC with is_organic_limb aswell where applicable.. also actual values for the other robo limbs. Fun!
* Add caltrop component for spikey floor objects
The caltrop component now can be added to any crossable atom, and it'll
act like a shard of glass, or a d4. Additional flags are possible for it
to bypass shoes or ignore people who are walking.
This means d4 don't reimplement shard logic, and also open the window
for caltrop grenades later.
Also, it taught me how components work.
* Code review I
* Caltrop damage is 4
* Cactus hurts
* Whoops
* Ignore restraints = true
