Add custom giveaway bots

[ghostyplayz]

It would be cool if, in the settings, you could add giveaway bots by their ids as I'm in a lot of servers with their own bots.

[Vedza]

It's not about the id, it's about the messages that the bot send, so I can determine if the sniper needs to react and if you won something.
The sniper try to detect giveaway only on bot account, no matter the id of the bot.