WARNING: Redesigned structs

- Mesh, Shader, Material structs have been reviewed to minimize size when passed by value, all required code has been reviewed.
 - GetCollisionRayModel() reviewed to avoid pointer, not required because model is not modified inside the function
 - UnloadMesh() reviewed, pointer not required
 - CheckCollisionRay*() parameters name reviewed

examples/models/models_mesh_picking.c

@@ -105,7 +105,7 @@ int main(void)
 
             // Check ray collision against model
             // NOTE: It considers model.transform matrix!
-            meshHitInfo = GetCollisionRayModel(ray, &tower);
+            meshHitInfo = GetCollisionRayModel(ray, tower);
 
             if ((meshHitInfo.hit) && (meshHitInfo.distance < nearestHit.distance))
             {