Converted Vector3, Matrix3x3 to POD data types.
Added float based ToMatrix3x3.
Converted array access based functions to constexpr (C++14).
Converted Quaternion to a POD data type.
Removed Vector.hpp, can use Vector3/4 now as they are POD classes.
Merge branch 'feature-gamestate-parallel' of github.com:JodiTheTigger/game-in-a-box into feature-gamestate-parallel