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Creates separate access for gaze estimation to avoid emiting new tuples
on evaluation.
Otherwise when we finish a calibration, a bunch of old tuples will be
logged to the journal

Moves from QElapsedTimer to chrono::steady_clock.
Uses frame timestamps provided by the frame if available, compensating
for drifts w.r.t. EyeRec time.

- 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

Uses data from both eyes for a single polynomial regression

Points considered to bias the evaluation points were being used anyway.
Although for the majority of CalibMe cases this had little effect --
because the large amount of points + spread give little weight to each
point -- it could be critical if the calibration points are only
concentrated around evaluation points -- e.g., N-Point calibrations.

Also, the whole gaze estimation logic needs to be untangled.

Do median outlier identification based on the mono / binocular calibration
setting.
Pick first available method if unknown was requested.

Webkit style (https://webkit.org/code-style-guidelines/)

Dear future me:

I'm sorry. Get ready for all those conflicts if you ever merge one of your old
branches. Since a lot of the code was being refactored at this time, they were
probably going to happen anyway.

Look on the bright side: Now everything is set to a single style.
Stay with it this time :-)

Moving from C to C++ null pointer style

Since we are not allowing for changes in these at runtime as was initially
planned, let's change that and make it constant

libuvc: 69e45682220ff93abc6d675acfaa8fc6de8f5fca

uvcengine: fce1f275eb53cc87725f7232944813bc36da75cf

Creates a base class for EyeRec widgets

Moving EyeRecToo to a public repository.
The commit history was removed as it may contain sensitive information.

Swirski and Starburst pupil detection algorithms are not included by default and
will be made available on separate repositories when the new pupil detection
plugin structure is included.

For internal use:

This is a reorganization of the build structure from:

Repository: EyeRecToo-internal
Branch: migration
Commit: a2da2fbbcb7521b538c81b9edfc855404702b35b