Refactored project structure

- Test project is now separated from engine code
 - Engine code can now initialize OpenGL and GLUT correctly
 - Moved vectors and quaternions to a Math subdirectory

Fixed reorder warning

example/displayers.h

@@ -0,0 +1,26 @@
+//
+// Created by trotfunky on 24/09/2019.
+//
+
+#ifndef TESTS_OPENGL_DISPLAYERS_H
+#define TESTS_OPENGL_DISPLAYERS_H
+
+#include <GL/glut.h>
+
+#include "DataHandling/Texture.h"
+
+/// Displays a square based pyramid from a base position, height and side length
+/// \param x X coordinate of the center
+/// \param y Y coordinate of the center
+/// \param z Z coordinate of the center
+/// \param c Side length of the square
+/// \param h Height of the pyramid
+void display_pyramid(float x, float y, float z, float c, float h);
+
+/// Draw a pyramid rotated around its axis
+void display_rotating_pyramid(float x, float y, float z, float c, float h, float alpha);
+
+/// Draw a tree with two quadrilaterals
+void display_tree(float x, float y, float z, float h, float w, const Texture& tree_texture);
+
+#endif //TESTS_OPENGL_DISPLAYERS_H