Flood protection

[ZeroKnight]

Implement flood protection, as relying on POE::Component::IRC is not an option. After x messages are sent in y seconds, keep track of a timestamp for the last message sent, then POE::Kernel::delay() the next send in speak() by z seconds.

For the threshold, something like 5 messages within 3 seconds with a 1-2 second throttle seems reasonable.

Also double check that PoCoIRC isn't doing any other throttling/protection