Fixed warm chickens' models so that they now appear correctly.

A few additions:

• Temperate chicks are now yellow instead of white
• The chicken spawn egg texture has been updated
• Naming a temperate chicken Debbie, Isla, Dora, Sooty, or Jeff will change its texture (they are based off my pet chickens)

!A temperate chicken in a birch forest followed by 4 yellow chicks

Initial release with temperate, cold, and warm chickens and chicks.