Blood refactor

[MrMelbert]

Lots of stuff to unpack here:

• Blood types are datums!
  • Blood can now be colored!
    • Code and icons inspired by species changes part 2: adds colored blood tgstation/tgstation#61610 but with some... alot... of changes.
    • Lizard blood is now green, inspired by the real life lizards with green blood.
    • Skrell blood is now blue, inspired by the real life aquatic creatures with blue blood.
    • Ethereals can now actually bleed. They bleed pools of Liquid Electricity which can shock people trying to mop it up with water.
    • Oil blood Is A Thing! No humanoids use it now, but in the future synthetics can use it.
    • Pools of different color / blood type will mix! The name even updates accordingly.

• Bloody Soles was refactored entirely,

• Lots of small fixes with blood related things.