Major change due to better performance of Vue and the browsers

New feature

• Moving backlog items between products in the detail view is now possible without using the context menu

Refactoring

• Allow all products to be opened in the detail view
• Save and retrieve tree expansion status when switching between detail and coarse view
• Adapt dependencies handling to multiple producs opened in the detail view

Bug fixes

• When another product is selected in the Details view, under conditions, the dragging mode is intiated: fixed
• Node not selected when opening context menu: regression fixed