Light-client sync for contract-based PoA

remove re-export of ansi_term in util

* fun start

* playin

* linting

* cleanup kk 1

* cleanup kk 2

* package

* oops

* grumbles

* lint

* lint 2

* all-possible-cases

* conflict resolution

* conflict resolution

* ready

* lint

* remove package-lock

* Restart subscription on transport close.

* Bring back the formatter.

* Fix formatter.

replace trait Hashable with fn keccak

* remove the redundant hasher in Bloom

* add the test to check the hash backward compatibility

Rewards on closing blocks

ensure balances of constructor accounts are kept

removed recursion from triedbmut::lookup

For commits with an annotated tag, that tag will be the version. For other commits, a git identifier will be used.
This way, there is no need to manually edit the snap version.