Only log events that match moderate-word filters

[jmhbnz]

The current approach of logging all events is wasteful we should probably only log full events when they match the word filters.

We should probably also log which word was matched for debugging purposes.

Fixes #56

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[mrbobbytables]

/ok-to-test

[BenTheElder]

/lgtm
thanks

[jeefy]

/approve

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