Advanced Giveaway System - Giveaway Manager
!create - Creates a giveaway step by step
!start [channel-name] [time] [winners] [prize] - Creates a giveaway step by step.
!delete <messageID> - Deletes a giveaway.
!end <messageID> - Ends a giveaway.
!edit <messageID> <new winner count> <new prize> - Edits a giveaway.
!reroll <messageID> - Rerolls a giveaway.
!invite - Sends GiveawayManager’s invite link.
!list - Lists all the active giveaways in the server.
!stats - Shows the stats of Giveaway Manager