Blender Git Loki

Camera tracking integration
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- Split clip hotkeys into two categories:
* Global
* Editing
This allows to re-use such hotkeys as track markers
from properties region without worrying about conflicts.
- Anchor point could now be offseted from marker position.
- Pattern can now be symmetrical relative to marker position only.
- Changes to mouse sliding:
* Left top rectangle used for marker position and now
it's half inside and half outside of marker.
* Right bottom corners are for size.
* Anchor point can be slided with mouse to adjust offset.
- Resolved conflict caused by left-mouse selection option.
Now it works perfectly with sliding -- no more "sticky" keys or so.
- Fixed some typos.