Backporting to beta (#4152)

* Fix broken transfer total balance (#4127)

* Add proper label to method decoding inputs (#4136)

* Another minor estimation fix (#4133)

* Return 0 instead of error with out of gas on estimate_gas

* Fix stuff up.

* Another estimate gas fix.

* Alter balance to maximum possible rather than GP=0.

* Only increase to amount strictly necessary.

* Get rid of unsafe code in ethkey, propagate incorrect Secret errors. (#4119)

* Implementing secret

* Fixing tests

* Refactor VoteCollector (#4101)

* dir

* simple validator list

* stub validator contract

* make the engine hold Weak<Client> instead of IoChannel

* validator set factory

* register weak client with ValidatorContract

* check chain security

* add address array to generator

* register provider contract

* update validator set on notify

* add validator contract spec

* simple list test

* split update and contract test

* contract change

* use client in tendermint

* fix deadlock

* step duration in params

* adapt tendermint tests

* add storage fields to test spec

* constructor spec

* execute under wrong address

* create under correct address

* revert

* validator contract constructor

* move genesis block lookup

* add removal ability to contract

* validator contract adding validators

* fix basic authority

* validator changing test

* more docs

* update sync tests

* remove env_logger

* another env_logger

* cameltoe

* hold EngineClient instead of Client

* return error on misbehaviour

* nicer return

* sprinkle docs

* Reenable mainnet update server. (#4137)

* basic tests for subscribeToEvents (#4115)

* subscribeToEvent fixtures ✅

* subscribeToEvent tests ✅

* temporarily skip failing test (#4138)

* Improvements and optimisations to estimate_gas (#4142)

* Return 0 instead of error with out of gas on estimate_gas

* Fix stuff up.

* Another estimate gas fix.

* Alter balance to maximum possible rather than GP=0.

* Only increase to amount strictly necessary.

* Improvements and optimisations to estimate_gas.

- Introduce proper error type
- Avoid building costly traces

* Fix tests.

* Actually fix testsActually fix tests

* Use estimateGas error (as per updated implementation) (#4131)

* Use estimateGas error (as per updated implementation)

* EXCEPTION_ERROR as per #4142

* Better error log reporting & handling (#4128)

* Don't pop-up notifications after network switch (#4076)

* Better notifications

* Don't pollute with notifs if switched networks

* Better connection close/open events / No more notifs on change network

* PR Grumbles

* Add close and open events to HTTP // Add tests

* Fix tests

* WIP Signer Fix

* Fix Signer // Better reconnection handling

* PR Grumbles

* PR Grumbles

* Fixes wrong fetching of balances + Notifications

* Secure API WIP

* Updated Secure API Connection + Status

* Linting

* Linting

* Updated Secure API Logic

* Proper handling of token updates // Fixing poping notifications

* PR Grumbles

* PR Grumbles

* Fixing tests

* Trim spaces from InputAddress (#4126)

* Trim spaces for addresses

* onSubmit has only value, not event

* onSubmit (again)

* Length check on trimmed value

* Remove bindActionCreators({}, dispatch) (empty) (#4135)