* Move blockchain::rocksdb into a separate crate

* Add license and description for blockchain-rocksdb

* Rename .0 -> .backend for easier extension

* Refactor set_genesis to a separate function

* Write to database in batch

* Make db opening return error

* Remove all unwrap in rocksdb backend layer

* Reliable open_or_create for rocksdb

* Update test vectors to v0.7.1 and integrate CI

* Remove transfer workaround

* Remove unnecessary mut

* [WIP] Initial runover of the 0.7 spec

* Make beacon compile again

* Add missing docs

* Fix block authoring logic

* Fix issue when attestation processing failed, state is changed

* Pass all tests for 0.7

* Update version tag

* Add support for voluntary exit tests

* Add support for crosslink tests

* Add support for registry updates test

* Refresh support for deposit operation

* Add support for attestation test

* Add support for attester slashing test

* Add BlockHeader tests

* Add support for proposer slashing tests

* Add support for transfer tests

* Add support for blocks and slots sanity test

* Add scripts to run state tests

* Fix script

* Fix test path change

* [WIP] Check v0.6.3 compilance for helper functions

* Check full spec compliance