Some warnings are out of date or too strict, while in other cases there are new warnings that should be added.
[x] Don't show a warning if there are 2 MC hosts - this is common nowadays (but even if there's only one, it's probably not a big deal).
[x] Consider removing or relaxing the checks in the plan summary (number of songs, number of items for the MC hosts, etc.). These seem to show up a lot even when there's nothing truly wrong.
[x] Ignore the "Name slide" note that's always in the plan on Planning Center for some reason.
[x] Show the number of notes (so that people can tell whether any aren't shown in the summary).
[x] Add some validation for message notes (e.g., prevent duplicate lines).
Some warnings are out of date or too strict, while in other cases there are new warnings that should be added.