Species Update Part 2

IN THIS UPDATE:

FEATURES: (Names subject to change)
* Organic plant people, named 'Chlorophytes', have been added to the roundstart species list.
* Three-eyed jelly people, named 'Xenoids', have been added to the roundstart species list.
* Lizardpeople have been renamed to 'Kokiyg' (thanks, PL)

Several changes have been made to the three playable species, making them slightly different from humans in very minor ways:
* The Kokiyg are cold-blooded, and thus their body temperature changes faster depending on the environment. Therefore, they will freeze and burn faster when exposed to cold/heat, but their body temperature will also normalize faster. Also affects the speed at which cryo works.
* Chlorophytes lose nutrients slower, and can eat more before becoming fat. Obviously, being made of plant matter, they also take more damage from burns.
* Xenoids slowly heal from clone damage, due to their bodies being made of gel-like material. For the same reason, they also take more damage from freezing, much like slimes. Since their skeleton is visible, their bones break more easily.

* Three-lensed versions of most glasses and goggles. Xenoids can only wear three-lensed or one-lensed (medhuds/monocles) eyewear items.
* Three-lensed eyewear items have been added to the majority of closets, where appropriate. Xenoids will spawn with them on depending on what job they have.
* Chlorophytes have luxurious leaf-hair, slightly darker than their mutant color.
* Xenoids have "hair" made of goo, similar to the slimepeople. It is also semitransparent.
* Added the framework and icons for the Lotyn species, but it's not completed yet.

BUGFIXES:
* Fixes divided-by-zero runtime with bone breaking code.
* Fixes breathing runtimes while in space.

TWEAKS:
* Several small changes to the species icons.
* A description for your selected species now appears on the preference screen.
* Above the 32x32 preview of your character, there is a 16x16 preview of your character:

![previews](https://cloud.githubusercontent.com/assets/4349173/3850910/d9496d0c-1e8c-11e4-9267-0fe13e892536.png)

* Kokiyg no longer stutter. I'm sorry, it was just too damn annoying (and other people were complaining about it too.)
* New NOPIXREMOVE specflag that allows species to not have their sides carved out by the evil magic of pixel removal while female.
* Various span classes.