Clear existing IRC event handlers before connecting to new ones

[bd808]

Clear IRC event handlers that we will be registering for the new connection before registering new handlers. This prevents duplicate event handlers in the case where we are connecting via a BNC and are seeing a reconnect. Attempting to clear handlers when none have been set is a no-op.

Fixes 42wim#1564 Co-authored-by: Andreas Vögele [email protected]

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[42wim]

LGTM, thanks!