Quaternion and 3D Rotations and some

This update complements the previous one, in that no real visual changes were made but big backend changes happened.

First of Engine, Executables and Tests are now separate projects. The first is now a Library included in the later projects.

Delta time is now available, allowing for a smoother experience.

Mouse locking on click and drag was added to the spherical camera controller.

Finishing up Travis building support was added.