Bug fixing : BasicScroll (see below)

Fixing a bug where the BasicScroll would throw a StackOverflow exception when launched on a keyboard that only has the default zone.
Also improved : if a keyboard has only one zone, the BasicScroll skips the zone to directly enters its children list.
upgrading the package versions
patch 2.6.0 :

- Removing notifications for now (thread concurrency problems)
- Using SendKey for Enter and Backspace
- The window is now draggable even on the background image
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