Add two new flags: --sync-ignore-file and --skip-item-index
#55
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--skip-item-indexuses the ignore.txt file as the source of truth for what's already downloaded, rather than looking through the filesystem. On my machine (~85 items in my Bandcamp collection, stored on a shared drive mounted via SMB), this option speeds up a single run from ~29.9s to ~0.9s.--sync-ignore-fileappends any downloaded items found in the filesystem to the ignore.txt file - just a slightly more convenient way to do this.This PR doesn't alter any existing functionality; new code is only touched if you pass one of the new flags.