options: add the concept of deferred settings

We've had a perpetual sequencing problem with addon startup. Users need to be
able to specify options to addons on the command-line, before addons are
actually loaded. This is only exacerbated with the new async core, where load
order can't be relied on.

This patch introduces deferred options. Options passed with "--set" on the
command line are deferred if they are unknown, and are automatically applied by
the addon manager once matching addons are registered and their options are defined.

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