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At 400x400 the contrast is really bad; playing around a bit, this seems to
be the best it gets.

Also changes default calibration method and maximum pupil size

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.

Moving to doubles and normalizing per resolution (so now we allow for
resolution changes given that the aspect ratio remains constant).

Makes it possible to mix polynomials

If startRecording() was called instead of startRecording(double),
videoWriter would never be initialized.

Thanks David Gil for pointing that one out

Adds the clang-format file and updates documentation after testing
on Linux (Ubuntu) and Windows

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

Headers now use QStringBuilder (through the % operator).
Data now use reserve and squezee combined with a (static!) cached size control.

1) Sends the header periodically
2) Buffers the output instead of dropping parts

uvcengine:
commit 027ecdff7d1184f244abe0d39c02db970c6816fa

libuvc:
commit 94ed414f422372c9ff500babc49779a15ee07917