Add 3 new type of object: Sphere, Object and Intersect.

Add Intersect object as a way to report where a ray intersect another object and which one it is.
Add an Object base class for all object that can be rendered.
Add the Sphere object.

source/intersect.cpp

@@ -0,0 +1,30 @@
+/*
+ *  DoRayMe - a quick and dirty Raytracer
+ *  Intersect implementation
+ *
+ *  Created by Manoël Trapier
+ *  Copyright (c) 2020 986-Studio.
+ *
+ */
+#include <stdlib.h>
+
+#include <intersect.h>
+
+#define MIN_ALLOC (2)
+
+Intersect::Intersect()
+{
+    this->allocated = MIN_ALLOC;
+    this->list = (Intersection **)calloc(sizeof(Object *), MIN_ALLOC);
+    this->num = 0;
+}
+
+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[this->num++] = i;
+}