Nerv pathtracer

Some part of the code have been rework, and some feature have been added :

• Support texture in models
• fix troughput bug that lead to bad energy consevation
• make QoL improvement over the last beta release
• reverse the bvh to remove holes to a less powerfull one sadly

Nerv pathtracer

this is the first beta release of the engine. as of now it containe :

• realtime pathtracing
• sampling
• ui
• lambert material
• glass material
• metalic material
• rougthness parametere
• model loading
• bvh
• config file