INT: moved the Shader class to the rendering::gl namespace
INT: moved Material and ShaderProgram class to the gl namespace
INT: moved stb_image and tiny_obj_loader to contrib
INT: moved Mesh class to the rendering::gl package
INT: finally moved the look and move camera into the camera class
INT: tinkering around with some ideas for the renderer/phong shader
INT: started extracted the GL context from the window in preparation for the SW part
INT: removed deprecated PhongShader and moved/renamed Renderer to PhongRenderer
INT: finished splitting the phong shader, finally ready for point lights (tuto#27)
INT: added point lights
INT: added a cuttoff range in point light
FIX: fixed some problem in the point light shader and calculated the range based on attentuation