Move Utah teapot model reading code into dedicated module

model.h

@@ -20,7 +20,7 @@ typedef struct {
 	size_t index_count;
 } model_t;
 
-model_t model_read(const char *path);
+model_t model_init(size_t vertex_count, size_t index_count);
 void model_cleanup(model_t *m);
 
 #endif