sf::RenderWindow -> sf::Window

TODO: Get 2d Stuff working
Color Class
Convert angles to Radians from degrees
Basic Math Library; Angles (Radian<T>, Degree<T>)
Color implemented everywhere!; VectorN unused ATM.
Spotlight use Radians
Small PhysicsEngine Tweaks
Spotlight setCuttoff -> setViewAngle
Merge branch 'dev_math' into dev
Array; Vector; print(ln); Texture2d; Math library
Math Library; Functions; Quaternion; Matrix4;
!!WIP!! Math Library - Not working yet!
Full Math Library!

No glm dependency.
Merge branch 'dev'