Add NLP parsing for cancellations

[mileserickson]

Cancellations may need to be inferred from human-readable ferry alerts, TIS data, and/or user reports if they are not reflected in the WSF schedule.

[anstosa]

According to the API, the /terminalsailingspace reports whether departures are cancelled but this is the first opportunity I've had to test that, and it does not appear to be the case

Similarly the /timeadj is supposed to report schedule adjustments in a structured way, but it appears that this type of cancellation is classified instead as a service disruption which is not structured
.

NLP, here we come! 🙄

For now I'll at least fix the filter preventing that alert from showing up in the app