Add a "close ticket" button and log closure to #mod-log

[vcarl]

closes #89

[what-the-diff]

PR Summary

• New Ticket Closure Feature:
  We've added a new function, the "Close Ticket" feature. This enables users who have the right roles to shut down their respective tickets or issues that they may have opened.

• Incorporated Message Components:
  We've put in place a new "Close Ticket" button. This is activated whenever a ticket is opened, offering users a quick and easy way to close their problems once resolved.

• Implemented Permission Assessments:
  Checks have been set in place to confirm that only the person who opened the ticket, or a moderator, can close the ticket. This ensures that issues aren't prematurely shut down by users who may not fully understand them.

• Better Error Responses:
  The system's response messages have been refined. They are now more detailed when there's either no member involved with the ticket interaction or when a user doesn't have sufficient permission to close the ticket.

• Refined Variable References:
  The system's variable references have been updated to include the modLog as a part of the settings retrieval. This improves the logging process when tickets are closed, ensuring every action is correctly and thoroughly recorded.