Xenin Coinflip - Supports all gamemodes

1. Added a cooldown between creating coinflips to prevent spam
2. Added the option to automatically ban people that create & delete coinflips purely to spam notifications. This is disabled by default

New config values

-- How long must a user wait before they can create another coinflip?

-- This exists to prevent spamming of coinflips creation & deletion, which will cause notification spam

-- If you don't want a cooldown, set it to 0

-- This accepts a number in seconds

cfg:SetCooldownBetweenCreation(1.25)

-- Should the system ban people who spam create & then immediately delete coinflips?

-- This is to prevent spamming of notifications

cfg:SetBanSpammers(false)