[TASK] Adjusts css for addons example
[BUGFIX] Sets class for visible slide correctly on edge case
[BUGFIX] Implements viewportOppByPanels sizer correctly

Correctly distribute the requested size for visible panels
between two visibility borders (currently called life and
dead zone). Should be much more robust now.
[TASK] Adds headers for each release version
[TASK] Updates webmerge to latest version
Updates webmerge and improves example headers