Organic Shields and Chitinous Armor for lings!

More shit for newlings!
* Organic Shield: A shield that will absorb a certain number of hits and then break. The number of hits is 3 multiplied by the amount of genomes total you've absorbed.
* Chitinous Armor: What it says on the tin. Scary dark armor so you can fite.

Now with 90% less duplicated code! Also adds fancy headers to mutations.dm
ffs why did i do this