Add multi interval select
These commits add possibility to use interval select window on several traces at the same time.
Tested :
- IntervalSelect window box and slider on one or several traces
- Moving / Scaling the trace from the view changes the IntervalSelect window
Thing that could change :
- Adding and closing traces while the IntervalSelect window is shown does not updates it (This will change when opening and closing traces is done properly)
- Moving a trace from the view updates every IntervalSelectLayouts, this will be individualized. It can't be for now.