updated jsonrpc modules and serde from 0.8 to 0.9

Updated dependencies + removed specific-commit version reference to tokio_core

Fixed `Script::find_and_delete` arguments

Send ping requests on timeout

Pass version message to sync when starting sync session

Temporary switched to github version of tokio-core

Get rid of separate cpu pool in sync

Fix build

Updated dependencies

Implemented blocknotify option

Remove debug print from sync

Fixed clippy warnings in sync

Mempool double send is now checked during reorganizations

Remove outdated todos in db

p2p statistics extended

Update rocksdb dependency

Sync refactoring

Bloom for transaction meta