pipe reader: don't mark commands as consumed until pending=0 #347
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Includes test from #346 (e90d588) - thanks for recreating @mtmk
Previously, commands that were partially trimmed but not sent had marked their data from the pipe reader as Consumed. On a Reconnect, the same amount of data would get Consumed again.
Refactors the Pipe Reader to only mark data as consumed once an entire command has been processed (pending == 0)
Also adds a bunch of comments to help explain the flow