Begin refactor, add documentation

core/Shaders/Shader.h

@@ -3,9 +3,9 @@
 
 #include <glm/gtc/type_ptr.hpp>
 
-#include "types.h"
-#include "Material.h"
-#include "Light.h"
+#include "../types.h"
+#include "../Material.h"
+#include "../Light.h"
 
 class Shader {
 public:

core/Shaders/SkyboxShader.h

@@ -2,7 +2,7 @@
 #define SKYBOXSHADER_H
 
 #include "Shader.h"
-#include "Skybox.h"
+#include "../Skybox.h"
 
 class SkyboxShader : public Shader {
 public: