Autorank

I've listened to your feedback and made some general 'quality of life improvements'!

Changelog:

- You can now add custom descriptions to requirements! For more info, see this.

- Fix the annoying error (in console) admins got when a new day/week/month arrived and their files were reset. 

- Autorank will now track the activity of players and you can request data about their play time in the last x hours/days/weeks/year.  Try using the /ar activity command!

- Added an option to reset the paths a player completed with /ar reset <player> completedpaths!

- Added a warning when Autorank detected a faulty AFK integration setup.

- Changed display of /ar hooks command; it's now more clear which plugins Autorank actually uses.

- You can now use the tab completion when trying to perform an Autorank command: try typing '/ar h' and then pressing TAB.

Have fun using Autorank!