Clear nodes counter when reseting project
Alt+ P is now default shortcut for toggling preview images
Roto: selecting keyframes with the rectangle will now select keyframes
of only selected curves, or  of all curves if no curve is selected.
Roto: holding down shift allows to enrich a selection
Roth : clicking on a selected point while maintaining SHIFT will remove
the point from the selection
Roto: Holding down CTRL  + SHIFT now allows to remove points from
selection with the selection rectangle
Fix constness
NodeGraph: selection is now always set on newly created nodes
(especially when pasting/cloning nodes)
Remove useless warning
Start supporting roto in curve editor, WIP
More support for bezier in curve editor, almost done.
This commit breaks compilation because the code is not finished.
Version that compiles: DO NOT USE CURVE EDIT, WIP!
Improve support for bezier animation edition in curve editor
CurveEditor: display bezier animation
Fix assert
You can now properly move keyframes animation of a bezier curve
Properly delete elements from curve editor when bezier is removed
Missing updateGL
Properly delete elements
Rect: fix doc