* Bound ahelp/mhelp replies more tightly to their ticket.
* Hardened PMs further against missing data.
* Support expanding Discord notifications for ahelp/mhelp.
Functionality changes:
* Informs the user when their ticket is reopened.
* Informs other mentors/admins when tickets are converted.
* Discord messages now get a "Ticket 3, " or similar prefix.
Not useful by itself, but will be with the following PR.
Code changes:
* When you create a ticket, you get the ticket object back.
* checkForTicket now allows you to fetch a ticket by number, and falls
back to searching for open tickets if the ticket isn't found.
* Corrected and simplified the logic for adding PMs to tickets.
* Responses are now added through the ticket system, not the tickets
directly.
