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Moved filesystem-related code out of SJS and into common.
Made it possible to have one, both or no filesystems enabled.
FailFS is now SimpleLinkFS, SLFS (ahem).

Example just serves a "Hello, world!" index page for now.

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Identifiers starting with _ are reserved, fix those.
Wrote a tool to do it and applied it globally, why not.

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Put cases in the order we expect them to occur