Download pieces in batches for piece cache sync #3151
Merged
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One more thing remained, the thing users complained about: piece cache sync.
This implements batched downloads, but only for initial sync. I was lazy to do it for keep-up sync right now and keep-up sync is much less critical.
Hit another one of the sub-issues of rust-lang/rust#110338 that I don't think I hit before, so had to waste a bit of time and do some unfortunate allocations to make it compile.
A lot of changes here are simply due to code being offset to the right.
Code contributor checklist: