Add a new static-asset-from-store-renderer function

Previously, the assets would be served from the store normally, but this meant
that they were read from disk each time, and stat calls were used to determine
when they were last modified.

This doesn't work for files in the store, as the timestamps are normalised,
therefore add a renderer that takes advantage of the asset directory being in
the store. All the files are read at startup, and then stored in memory. Also,
the process start time is used as a value for the last modified header, which
isn't ideal, but it's better than 1970.

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