* use PeerInfo in event handlers
* use CidV1 and raw multicodec as default
* add block stream abstraction
* raises defect
* adding dataset abstraction
* move blockstream into own dir
* reorg files and fix tests
* rename dataset to blockset
* wip
* wip
* adding basic test for treehash algo
* run blockset tests along with with the rest
* remove obsolete contents
* fix chunker tests
* rename bitswap and move to stores
* rename bitwsap to blockexc and move to stores
* moare project structure reorg
Dmitriy Ryajov