Switch event system to use tuples instead of varargs

[TellowKrinkle]

This switches the event system from passing values as a varargs (Any...) to a single Any argument (which can be a tuple to pass multiple values).

Pros:

• Faster
• Simpler syntax (let (guild, role) = data as! (Guild, Role) vs let guild = data[0] as! Guild; let role = data[1] as! Role)

Cons:

• Breaking change, will require an update of all code that registers event handlers. The compiler will catch the error, at least, since data[0] is no longer valid.

[Azoy]

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