Change the Intersection to a class, and stop using memory allocation for it (and pointer)

A bit more clean (on the code side)

source/intersect.cpp

@@ -15,16 +15,16 @@
 Intersect::Intersect()
 {
     this->allocated = MIN_ALLOC;
-    this->list = (Intersection **)calloc(sizeof(Object *), MIN_ALLOC);
+    this->list = (Intersection *)calloc(sizeof(Object *), MIN_ALLOC);
     this->num = 0;
 }
 
-void Intersect::add(Intersection *i)
+void Intersect::add(Intersection i)
 {
     if ((this->num + 1) < this->allocated)
     {
         this->allocated *= 2;
-        this->list = (Intersection **)realloc(this->list, sizeof(Object *) * this->allocated);
+        this->list = (Intersection *)realloc(this->list, sizeof(Object *) * this->allocated);
     }
     this->list[this->num++] = i;
 }