* evm: keeper statedb refactor
* keeper: implement stateDB account, balance, nonce and suicide functions
* keeper: implement stateDB code and iterator functions
* keeper: implement stateDB log and preimage functions
* update code to use CommitStateDB
* tests updates
* journal changes (wip)
* cache fields
* journal and logs
* minor cleanup
* evm: state transition refactor
* evm: unpack revert errors
* evm: update state transition (wip)
* evm: remove journal related changes
* evm: delete empty account code and storage state
* update gas limit
* evm: header hash to/from context
* evm: minor params and state transition changes
* ante: state transition changes
* ante: refactor default sig gas consumer
* ante: ignore gas costs from ops other than intrinsic gas
* ante: CanTransferDecorator
* evm: refund gas
* update comments
* state transition comments
* ante: CanTransfer and AccessList decorator tests
* evm: cleanup state transition
* ignore nonce increment during ante handler on contract creation
* fix ante tests
* more test fixes
* Update sdk version, implement pending txs, fix nonce check
* Bump cached dependencies in circleCI
* bump circleci go version
* updated linter and fixed bugs relating to go version 1.13
* WIP implementing state transition function
* Error handling and application setup fix
* Fixed error comment
* Allow creation of state objects with a BaseAccount
* Fixed parameters and finalise state after transaction
* updated transaction signing and cli signature
* Set up consistent account encoding and decoding
* Update txbuilder to get sequence before generating eth tx
* Added create functionality to the CLI command
* Remove need to copy over context for statedb interactions
* Updated account retriever
* Cleaned up handler code and updated TODO
* Make recoverEthSig private again
* Add error check for committing to kv store
* Remove commented out code
* Update evm chain config for state transition
* Add time in context for dapps
* Fixed circleci config and fixed linting warnings
* Updated circleCI for go version 1.12 and split jobs for build/testing
* updated go version to 1.12.5 for circleCI
* Go mod tidy dependencies
* Updated linting tools and cleared up code lint smells
* Added workflow to run build and test jobs
* Moved linting command to build workflow
* Get dependencies before linting by default
* Added go module flag to linter and increased deadline to pull packages
* Rename Ethereum tx message
* Use new tx decoder in the ethermint app
* Update ante handler to prevent spam/dos
* Update ethereum msg signing/verification logic
* Implement secp256k1 key types
* Remove pointer from To method
* Move sig check to after inartistic gas check
* Add comment on chainID parsing
* Updated validateIntrinsicGas godoc
* Implement Fee method on eth tx msg
* Add reference to spec for recoverEthSig
* Upgrade TM to v0.27.0
