Entity-O-Meter, new textures/models, climatic sounds

These are the new things for today. I couldn't stop adding some new features like environmental sounds for climate belts (some rarely played nice bird sounds while walking around, or eagle cry over the desert :) ), the new Entity-O-Meter (icons showing the detected groups (will be skill based if you can detect them or not)) and some refactoring for the houses in texture and model too (also added the steps created by theotherhiveking with a wooden texture on it). I'll check a few things yet but the prealpha release is due in a few days. I hope you like these news! :)