Adamantine Golem rewrite stuff

still some stuff to do:
if you know how to do these let me know:

[ ] give no eat?
[ ] make it non gendered
[ ] drop adamantine on death?
[ ] remove blood splatters on ground and golem itself from hitting it or gibbing it
[ ] make gibber gibs the proper color
[ ] fix up blood colors or hopefully stop blood appearing altogether
[ ] new brain type and sprite (golem core or something) or use the synthetic brain?
[ ] give eyes? (it can see anyway)
[ ] alter gibs to adamantine chunks
[ ] no healing? - not sure
[ ] denting instead of bruising - not sure
[ ] no [BLEEDING] when damaged
[ ] make non-injectable - not sure
[ ] starting as one gives it more features such as eyes and i think complete organs - whereas spawning via rune doesnt
[ ] fix all blood stuff (maybe just give alternate fluid instead of blood - or not)
[ ] should it be able to eat?

there should really be a mob.gibbify() method that just instantiates types defined in the mob, so all you'd need to do is:
```
/mob/living/carbon/human/golem
  var/meat_type = /obj/item/stack/sheet/mineral/adamantine
  var/gib_type = /obj/effect/decal/cleanable/blood/gibs/golem
```