Roman Lebedev e589486907 Song: add pretty-printers for EBU R 128 Integrated Loudness and Loudness Range fields
They end up being used in a quite a number of places later on,
it makes sense to have them in a common place.

Integrated Loudness (LUFS) is *usually* negative, so we really want to
always print a sign. But Loudness Range is non-negative.

I think it makes sense to print one or at most two decimal places for these.
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