Blender Git Loki

Camera tracking integration
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Changes to manual calibraiton:

- Grease pencil is now getting distorted, so now workflow is
changing to making straight GP line line match footage.

I've tried to make GP lines not changing their start and
end points from their "keyed" position.

Should be tested because this could be done not in
very accurate way.

- Fixed crash when adding new GP layer when there's no
frames yet and manual calibration is enabled.