Added Webhooks to event store

[tofarr]

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[tofarr]

I backed it out the previous attempt because we decided to go in a different direction and there was no explicit request from the community for it - Leaving it in meant that we would have to build / test / document both sides of a complex custom protocol, and the webhook based solution matched our needs and would likely be more useful to others too. We figured that keeping events in a local file store with a process for external synchronization was far more efficient than using a pure network attached event store.

I'll update the documentation with the with implementation details.

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