Use and improve internal iteration support #71
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In the latest "This Week in Rust", one update to Rust core was to use
for_eachwhere possible on a few things to allow complex iterators to use specialized behavior in the form offoldto improve performance.So, in this PR (aside from a few changes due to rustfmt updates) it is now using internal iteration via
for_eachwherever possible, and I've implemented a specializedfoldonGenericArrayIterto allow faster traversal of it insidefor_each.