Cancelling events: CancelEvent() & WasEventCanceled()

Sometimes one handler needs to veto the rest. A spawn-protection script blocks the death-handler chain. An anti-cheat resource cancels playerConnecting for a banned identifier before any other resource lets the player in. CancelEvent() is the signal; WasEventCanceled() is how downstream handlers know. The trap most people fall into is assuming CancelEvent() is a hard stop. It is not. It is a flag, and this lesson exists to make that distinction obvious.