import oplog improvements (#54)

* report down/up transfer speed during progress
* add disk buffering in http client
* offload block decoding and chunk writing form network worker pool threads
add block hash verification for blocks recevied at oplog import
* separate download-latch from write-latch to get more accurate download speed
* check headers when downloading with http client to go directly to file writing for large payloads
* we must clear write callback even if we only provide it as an argument to the Download() call
* make timeout optional in AddSponsorProcess
* check return codes when creating windows threadpool

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