Better add/edit functionality invocation

[MarisArins]

While keeping existing admin-menu functionality in sidebar, why not to introduce buttons on collections/communities/items to edit them without invoking sidebar, navigating to menu, performing search in the lookup etc.

This would be major UX improvement as existing aproach is multi-stepped and not always works well.

[artlowel]

This has been planned (and is already under development) for #843