Editing Property:Leather Yield

As of 1.1.2610, the formula for leather yield is 30 * bodysize, with the following post-process curve:
* (0,0)
* (5,14)
* (40,40)
* (100000,100000)

There are a few exceptions, specifically:
* [[Human]]s have a leather yield of exactly 50
* [[Insectoids]] have a leather yield of 0
* [[Chicken]]s and [[duck]]s have a leather yield of 0
* [[Goose|Geese]] have a base value of 36 * bodysize instead of 30 * bodysize, resulting in a total actual yield of 21 birdskin after accounting for their 0.4 bodysize and the post-processing curve.

{{Property with Page
| page = Leathers
| type = Number
}}