GitLab

For the time being, the playback implementation is silly and will overload
the event loop.

Compilation for Linux should be temporally broken

- Updates icons, licenses, and copyright

- Post processor (in beta; there are many things that need to be fixed and
  improved)

- Integrates gaze estimate into the gaze estimation pipeline

- Already adding Eigen as it will be necessary when we merge Grip and the
  eye model