* Get tests passing
* Get benchmarks compiling
* Fix EF withdrawals test
* Remove unused deps
* Fix tree_hash panic in tests
* Fix slasher compilation
* Fix ssz_generic test
* Get more tests passing
* Fix EF tests for real
* Fix local testnet scripts
## Proposed Changes
Implement the consensus changes necessary for the upcoming Altair hard fork.
## Additional Info
This is quite a heavy refactor, with pivotal types like the `BeaconState` and `BeaconBlock` changing from structs to enums. This ripples through the whole codebase with field accesses changing to methods, e.g. `state.slot` => `state.slot()`.
Co-authored-by: realbigsean <seananderson33@gmail.com>