End Vote After Specified Time

[benrick]

Allow a vote to end after a specified time limit.

Example:
!vote new Red Blue Create a vote on whether Red or Blue is better.
!vote end 2m Sets a 2 minute timer to end the vote (will override a previous vote ending timer).
!vote end Ends a vote immediately.

• Even if time limit already set, vote can still be manually ended early by using the !vote end command again.