Reduce the amount of items visible on the notification macro edit

There's currently 14 items. They are all put in a large list

Miller's law tells us that any list with more than 7 items will be less and less usable.
14 is way above this threshold. We don't enforce Miller's law, but it shows there's a non negligible issue for users here.

A solution should be found and implemented to reduce the amount of information shown on this first view.

A possible solution is grouping optional items.
Another solution is to display some items only when they are actually used. `useUserPreferences` can disable a few parameters when set to `true`.