fix: datepicker now reacts correct on "required", placeholder is now passed through,stopScroll and startScroll don`t have to pass a variable
chore: merge
fix: datepicker now with correct validation, placeholder passed through, set Type of date dd.MM.yyyy works
fix: lint errors
fix: datepicker clear code, still one error left
chore: extend navigation with an treeview directive and the according styles
Merge remote-tracking branch 'origin/v0.4' into v0.4