Fixes AI crew monitor runtime
Fixes AI crew monitor runtime

Instead of the AI crew_monitor being a per-AI variable, it was shared by
all AIs, and recreated each time a new AI was created, as part of that
AI's contents. Bots create and delete a new AI every time they transmit,
which means the crew_monitor would be deleted the moment a bot spoke
over the radio, causing it to runtime.

It is now a per-AI variable.

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