Allow to quickly close a todolist or todo
requested to merge 623-ask-if-the-parent-item-shall-be-marked-as-done-once-all-items-within-it-are-marked-as-done into development
When a todo or task is marked as done and its parent item is currently open, we now display a tool tip which allows the user to also close the parent item.
Closes #623 (closed)