Adds class to be able to hide single navigation dots

Actually we add a class indicating how many nav-dots are
actually shown. With this you can target the whole wrapper
when only 1 or 0 navigation dots are shown (i.e. hide it).
Re-implements swipe inertia and offset calculation

Hopefully this will work in a lot more situations and
finally give a robust solution to the panels grouping
problem with swiping.
[TASK] Commits merged release files