Rewrite file systems to use ByteChannels#575

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SquidDev wants to merge 4 commits intodan200:masterfrom

SquidDev-CC:feature/file-seeking

Commits on Sep 26, 2018

Rewrite file systems to use ByteChannels
SquidDev
committed

Commits on Oct 24, 2018

Couple of minor improvements to the previous commit
SquidDev
committed

Commits on Oct 28, 2018

Fix a couple of other bugs with the fs rewrite
SquidDev
committed

Commits on Nov 3, 2018

Fix resource handle loading
SquidDev
committed