Merge branch 'terencehill/menu_listbox_changes' into 'master'

Menu listbox changes

Menu listbox changes:
* scrolling with mouse wheel / scrollbar no longer changes the current selection
* scrolling and selection changes are now smooth
* FIX: remove highlighting from the focused item when the cursor is moved to the scrollbar area
* FIX: Highlight the focused item even while scrolling
* stats list no longer shows a selected item as it's useless
* servers list no longer automatically scroll at the beginning following the first seen server

See merge request !150