Major sync <-> client interactions refactoring (#1572)

* chain notify trait

* replaced network service with io service

* fix ethcore crate warnings

* refactored network service without generic

* ethcore fix

* ethsync refactoring

* proper linking of notify

* manage network interface

* rpc crate rebinding

* full rewire

* sync internal io service

* fix deadlock

* fix warnings and removed async io

* sync imported message propagation

* fix rpc warnings

* binart warnings

* test fixes

* rpc mocks and tests

* fix util doctest

* fix message name and removed empty notifier

* pointers mess & dark mode fixed

* fixed sync doctest

* added few warnings

* fix review

* new convention match

* fix error unwraps

* doctest fix