bake: Commonize worker pool code between html and asset baking. The `workerpool` package now defines a generic-ish worker pool. It's similar to the Python framework pool but with a simpler use-case (only one way to queue jobs) and support for workers to send a final "report" to the master process, which we use to get timing information here. The rest of the changes basically remove a whole bunch of duplicated code that's not needed anymore.

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title: PieCrust System Messages
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Here are the **PieCrust** system message pages:

* [Requirements Not Met]({{ pcurl('requirements') }})
* [Error]({{ pcurl('error') }})
* [Not Found]({{ pcurl('error404') }})
* [Critical Error]({{ pcurl('critical') }})

This very page you're reading, however, is only here for convenience.