Blender Git Loki

Camera tracking integration
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Change behavior of alternate transformation/marker sliding:

- Update all markers from track position when sliding marker by
it's left-top corner of pattern.
This prevents confusing when adding offset to already tracker marker.
- The same change was done to translation tool.
- To switch to "offset" mode of translation tool now you should use
G-key (hit it during translation). Alt key wasn't so good idea
because it's quite common hotkey in linux to move windows.