Whichever function were responsible for instantiating this map would
inevitably end up scaling in length based on the number of funtions and
thus violate the function length linter.
As a compromise, we'll factor out the function table into its own function
that is exempt from that linter but focused only on constructing the base
function table, and then Scope.Functions can be shorter by dealing only
with the scope-specific customizations of the returned table.
Signed-off-by: Martin Atkins <mart@degeneration.co.uk>
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