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Since we now have sub-millisecond precision in the data, we control output
width based on the fractional part so we don't lose precision

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

Also changes default calibration method and maximum pupil size

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

This gives us sub millisecond precision.
Moves to ns elapsed time where pertinent.

Also make some small improvements with the timestamps and couple
functions' signature

libuvc: 69e45682220ff93abc6d675acfaa8fc6de8f5fca

uvcengine: fce1f275eb53cc87725f7232944813bc36da75cf

Code further profiled, and removed a couple unnecessary operations.

Added information about possible move to OpenGL for the camera widgets.

Fixed bug for eye processor pre-processing downscaling.

Assumes that source provides a monotonic timestamp source;
if not, latency before present is not accounted for.

Previous assumption regarding latency failed since frames were
accumulating in the event loop under heavy load

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