merge master

CMakeLists.txt

README.md

assets/materials/standard.yml

assets/materials/subsurfaceScatter.yml

assets/models/Icosphere.yml

assets/models/Suzanne.yml

assets/scenes/_default.yml

assets/scenes/demo1.yml

assets/scenes/skybox.yml

assets/shaders/base.glsl

assets/shaders/standard.glsl

assets/shaders/subsurfaceScatter.glsl

docs/config.example.yml

include/overkill/EntityCamera.hpp

include/overkill/EntityDirectionalLight.hpp

include/overkill/EntityPointLight.hpp

include/overkill/Scene.hpp

include/overkill/ShaderSystem.hpp

include/overkill/UniformBuffer.hpp

src/EntityCamera.cpp