Discord Bot Invex Updates

[Bot Invex]

Changes:

• Discord names are now correctly stored and displayed correctly using full UTF-8 on the forums
  
• Added new Discord welcome message for people who join the server (thanks Squidward) [LINK]
  
• Purge/Purgeuser admin commands now auto disappear after 10 seconds to avoid cluttering the text channel they were used in.
  
• Fixed critical SQL injection vulnerability (thanks Tick)
  
• Temporary channels are now only stored by id and retrieved when added. This removed the possibility of stale channel data being used by various commands.
  
• Suppressed commands.CheckFailure in error handler
  
• Moved hardcoded text for verify command to config
  
• A new List Users feature has been added (thanks Jae) [LINK]
  
• Fixed bug where temporary channels would not expire due to soft crashes (Thanks @Sam and Andi)
  
• Various other minor fixes.