Ultimate Randomizer

• added an error message when starting the randomizer with an empty player list

• added the players subcommand to add & remove players from the player list
• /randomizer will now display whether the randomizer is enabled or disabled

• added shuffle command
• added support for 1.13+ (not all versions tested, please report any issues on the GitHub page)

• added plugin message configurablilty
• minor fixes

Initial release