Blender Git Loki

Camera tracking integration
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- Damn hidden searches. Again fix in select_all operator.
This time for inverted selection.
- Do not select "hidden" parts of marker on creation.
- Added modifier key for marker transformation:
if alt is pressed down -- pattern/search will be moving
relative to marker center.
- Changed behavior of mouse sliding:
* To change marker position markers should be slided by it's center.
* Left-top corners now used to offset pattern/search relative to
marker center.
* Hide mouse cursor during sliding.