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.

from piecrust.serving.server import Server


def get_app(root_dir, sub_cache_dir='prod', enable_debug_info=False):
    server = Server(root_dir,
                    sub_cache_dir=sub_cache_dir,
                    enable_debug_info=enable_debug_info)
    app = server.getWsgiApp()
    return app