Updated texture and model loading path and removed GLEW calls

So I found out GLEW is totally useless here because it's not necessary on MacOS. Nice
Migrated the project to XCode

Even though printf can be a great debugging tool, I need a better debugger

The .xcodeproject file contains all configuration needed. There is a minor change in the directories in main.cpp and texture.cpp to load models and texture. Codewise, that's the only change